| sacrare | sacred |  | sacr-, -secr- | sacrare, from sacer (genitive sacri) | consecrate, desecrate, sacrament, sacred, sacrosanct |
| saeptum | fence, partition, enclosure |  | sept- | saeptum | transept |
| saeta | bristle, hair |  | set- | saeta | seta, setose |
| sagax | wise |  | sagac- | sagax, sagacis | sagacious, sagacity |
| sagitta | arrow |  | sagitt- | sagitta | sagittal plane, Sagittaria |
| salire | jump |  | sali-, -sili-, salt- | salire, saltus | assail, assailable, assailant, assailment, assault, assaultive, consilience, desultory, dissilience, dissilient, exult, exultant, exultation, insult, insultation, irresilient, resile, resilement, resilience, resiliency, resilient, result, resultant, salacious, salacity, salience, salient, sally, saltando, saltant, saltation, saltatorial, saltatory, saltigrade, saltire, salto, saltus, sault, sauté, sauteuse, sautille, sautoir, somersault, soubresaut, subsultory, transilience, transilient |
| salis | salt |  | sal- | sal, salis, salere, salarium | salary, salinity |
| salix | willow |  | salic- | salix, salicis | salicin |
| salus | health, welfare |  | salu- | salus | salubrious, salubrity, salutary, salute |
| salvus | save |  | salv- | salvus, salvare | salvage, salvation, salve |
| sancire | holy |  | sanc- | sancire (past participle sanctus) | sacrosanct, saint, sanctify, sanction, sanctuary |
| sanguis | blood |  | sanguin- | sanguis, sanguinis | consanguinity, sanguinary, sanguine |
| sanus | healthy |  | san- | sanus | insane, insanity, sanatorium, sane, sanitarian, sanitarium, sanitary, sanitation, sanity |
| sapere | taste, wise |  | sapi-, -sipi- | sapere “to have a taste, be wise”, related to sapor “taste, flavor” | insipid, insipience, sapient |
| sapo | soap |  | sapon- | sapo, saponis | saponification |
| sartor | tailor |  | sarc- | sartor “tailor”, from sarcire “to mend” | consarcination, sartor, sartorial, sartorius |
| satis | enough |  | sati- | satis | asset, sate, satiate, satiety, satisfy, saturate |
| saxum | rock |  | sax- | saxum | saxatile, saxicavous, saxicoline, saxifrage, saxifragous |
| scabere | scratch |  | scab- | scabere | scabies |
| scala | ladder, stairs |  | scal- | scala | scalar, scale |
| scandere | climb |  | scand-, -scend-, scans-, -scens- | scandere | ascend, ascendency, ascendent, ascension, ascent, condescend, condescendence, condescension, descend, descendent, descension, descent, scansion, transcend, transcendence, transcendent, transcendental |
| scindere | split |  | scind-, sciss- | scindere | rescind, scissors |
| scire | know |  | sci- | scire | conscience, conscious, conscientious, omniscious, omniscient, prescient, science, scienter |
| scribere | write |  | scrib-, script- | scribere, scriptus | describe, inscribe, manuscript, prescribe, scribble, scribe, script, scripture, subscribe |
| scrupus | uneasiness |  | scrupl- | scrupus “sharp stone” | scruple, scrupulous, unscrupulous |
| sculpere | carve |  | sculp- | sculpere, sculptus | insculp, resculpt, sculp, sculpsit, sculpt, sculptile, sculptor, sculptress, sculptural, sculpture |
| scutum | shield |  | scut- | scutum | scute |
| sebum | tallow |  | seb- | sebum | sebaceous, sebum |
| secare | cut |  | sec-, sect-, seg- | secare | secant, section, segment |
| sedare | settle, calm |  | sed- | sedare, sedatus | sedative |
| sedecim | sixteen |  | sedec- | sedecim | sedecimal |
| sedere | sit |  | sed-, -sid-, sess- | sedere, sessus | assiduous, insidious, obsession, possess, preside, president, reside, resident, sedentary, sediment, sedimentary, sedulity, sedulous, session, subside, supersede |
| segetum | in cornfields |  | seget- | segetum | |
| sella | saddle, seat |  | sell- | sella | sella turcica |
| semen | seed |  | semin- | semen, seminis | insemination |
| semis | half |  | semi- | semis | semiannual, semicolon, semiconductor, semiconscious, semifinal, seminatural |
| senex | old man |  | sen- | senex, senis | senator, senescent, senile, senility, senior |
| seni | six each |  | sen- | seni | senary |
| sentire | feel |  | sent-, sens- | sentire, sensus | assent, consensus, consent, dissent, resent, scent, sensation, sense, sensible, sensitive, sensory, sentence, sentient, sentience, sentiment |
| septem | seven |  | sept- | septem | septennial |
| septeni | seven each |  | septen- | septeni | septenary |
| septimus | seventh |  | septim- | septimus | septimal, septime |
| septuageni | seventy each |  | septuagen- | septuageni | septuagenary |
| septuagesimus | seventieth |  | septuagesim- | septuagesimus | septuagesima, septuagesimal |
| septuaginta | seventy | | septuagint- | septuaginta | Septuagint |
| sequere | follow |  | sequ-, secut- | sequere, from sequi, see also secutus | consecutive, consequence, ensue, non sequitur, obsequious, prosecute, pursue, second, sequel, sequence, subsequent |
| serere | attach, join |  | ser- | serere, sertus | assert, assertion, assertive, curviserial, desert, desertion, desertrix, dissert, dissertation, dissertator, exert, exertion, insert, insertion, multiseriate, reassert, reassertion, rectiserial, semidesert, serial, seriate, seriatim, series, sermon, uniseriate |
| serere | sow |  | ser- | serere, satus | disseminate, dissemination, insemination, postseason, preseason, sation, sative, season, seasonable, seasonal, semen, semenuria, seminal, seminar, seminarian, seminary, semination, seminiferous |
| serpere | crawl, creep |  | serp- | serpere, serptus | serpent |
| serra | saw, saw-toothed |  | serr- | serra, serrare | biserrate, serrate, serration, serrature, serriform, serrulate, sierra, sierran |
| serum | whey |  | ser- | serum | serac, serosa, serous, subserous |
| servare | save, protect, serve |  | serv- | servare | conserve, deserve, observe, preserve, reserve, servant, service, servile, servitude, subservient |
| sesqui | one and a half |  | sesqui- | sesqui | sesquialteral, sesquicentennial, sesquipedal, sesquiplicate, sesquitertian |
| severus | stern, strict, serious |  | sever- | severus | asseverate, asseveration, perseverance, perseverant, perseverate, perseveration, perseverative, persevere, severe, severity |
| sexageni | sixty each |  | sexagen- | sexageni | sexagenarian, sexagenary |
| sexagesimus | sixtieth |  | sexagesim- | sexagesimus | Sexagesima, sexagesimal |
| sextus | sixth |  | sext- | sextus | bissextile, bissextus, semisextile, sestet, sestina, Sext, sextain, sextan, sextans, sextant, sextary, sextic, sextile, sextillion, siesta, sixte |
| sexus | sexual |  | sex- | sexus | sexual, sexuality, sex, Sexual Intercourse (abbr. “sex) |
| sex | six | | sex-, se- | sex | semester, sexangle, sexangular, sexavalent, sexennial, sexennium, sexireme, sexivalent, sexpartite, sexradiate, sextain |
| se | away, apart |  | se-, sed- | se | secede, sedition, seditious, seduce |
| sibilus | hiss |  | sibil- | sibilus, sibilare | sibilance |
| siccare | dry |  | sicc- | siccare ”to dry“, from siccus ”dry, thirsty“ | desiccate, desiccation, sec, siccative |
| sidus | star |  | sider- | sidus, sideris | sidereal |
| signum | sign |  | sign- | signum | design, designate, insignia, signal, signature, significant |
| silere | quiet or still |  | sil- | silere | silence |
| silva | forest |  | silv-, sylv- | silva, sylva | silviculture, sylvan, sylvatic |
| simia | ape, monkey |  | simi- | simia | simian |
| simulare | likeness, imitating |  | simil-, simul- | simulare ”to emulate“, from similis ”alike“ | assimilate, dissimilate, dissemble, ensemble, resemble, semblance, similar, similarity, simile, similitude, simulacrum, simular, simulate, simulation, simulator, simultaneous, verisimilar, verisimilitude |
| Sina | China, chinese |  | sin- | Sina | sinology, Sinanthropus |
| singulus | one each |  | singul- | singulus | singular |
| sinister | left |  | sinistr- | sinister, sinistri | sinistral |
| sinuare | (to draw) a line |  | sinu- | sinuare | insinuate |
| sinus | hollow, bay |  | sinus- | sinus | sinusoidal |
| sistere | cause to stand |  | sist- | sistere | assist, consist, desist, exist, insist, persist, resist, solstice, subsist |
| socius | group |  | soci- | socius, sociare | associate, association, associative, consociate, consociation, consociational, disassociate, disassociation, dissociable, dissocial, dissociate, dissociation, dissociative, interassociation, nonassociative, sociability, sociable, social, sociality, societal, society |
| solari | comfort, soothe |  | sol- | solari | consolation, console, solace |
| solere | accustomed |  | sole- | solere ”be accustomed“ | insolence, insolent, obsolescence, obsolescent, obsolete |
| solus | alone, only |  | sol- | solus | desolate, desolation, desolatory, saudade, sole, soliloquy, solitaire, solitary, solitude, solitudinarian, solitudinous, solivagous, solo, sullen |
| solvere | loosen, set free |  | solv-, solut- | solvere, solutus | absolute, absolve, dissolute, dissolve, resolute, resolve, soluble, solute, solution, solve, solvent |
| sol | sun |  | sol- | sol, solis | circumsolar, extrasolar, insolate, insolation, solar, solarium, soliform, soliscence, solstice, subsolar |
| somnium | dream |  | somni- | somnium | somnial |
| somnus | sleep |  | somn- | somnus | insomnia, somnambulist, somnifacient, somniferous, somnific, somniloquy, somnolent |
| sonus | sound |  | son- | sonus | absonant, ambisonic, assonance, assonant, assonate, consonance, consonant, consonous, dissonance, dissonant, inconsonance, inconsonant, infrasonic, infrasound, magnisonant, resonance, resonant, resonate, resound, sonance, sonant, sonata, sondage, sonnet, sonorant, sonority, soun, sound, subsonic, supersonic, triconsonantal, ultrasonic, ultrasound |
| sopor | deep sleep | | sopor- | sopor | sopor, soporific |
| sorbere | suck |  | sorb-, sorpt- | sorbere | absorb, absorbency, absorbent, absorption, absorptive, absorptivity, adsorb, adsorbent, adsorption, exsorption, insorption, malabsorption, resorb, resorption, resorptive, sorbent, sorbile, sorbition, sorption |
| sordere | dirt |  | sord- | sordere, sordes | sordes, sordid |
| soror | sister |  | soror- | soror | cousin, sororal, sororate, sororicide, sorority |
| spargere | scatter, sprinkle |  | sparg-, -sperg-, spars-, -spers- | spargere | asperse, aspersion, aspersive, dispersal, disperse, dispersion, dispersive, insperse, inspersion, interspersal, intersperse, interspersion, nonaspersion, nondispersive, nonsparse, sparge, spargefaction, sparse, sparsity |
| spatium | space |  | spati- | spatium | interspace, interspatial, space, spatial, spatiate, subspace |
| specere | look |  | spec-, -spic-, spect- | perspicuus, specere, spectare, speculari | aspect, aspectual, auspicate, auspice, auspicious, biaspectual, bispecific, bispecificity, circumspect, circumspection, circumspective, conspecific, conspecificity, conspectus, conspicuous, despection, despicable, despiciency, despise, despite, disrespect, disrespectable, especial, expect, expectancy, expectant, expectation, inauspicious, incircumspect, inconspicuous, infraspecific, inspect, inspection, inspector, inspeximus, interspecies, interspecific, intraspecies, intraspecific, introspection, introspective, irrespective, multispecific, multispecificity, multispectral, nonspecific, perspective, perspicacious, perspicuity, perspicuous, prospect, prospective, prospector, prospectus, prospicience, prospicient, reinspect, respect, respectability, respectable, respectant, respective, respite, retrospection, retrospective, special, speciality, speciation, specie, species, specific, specification, specificity, specimen, speciosity, specious, spectacle, spectacular, spectacularity, spectant, spectation, spectator, spectatorial, spectral, spectre, spectrum, specular, speculate, speculation, speculative, speculator, speculatory, speculum, spice, spite, subspeciality, subspecies, suspect, suspicion, suspicious, transpicuous, trispecific, unispecific |
| spes | hope |  | sper- | spes, sperare | despair, desperado, desperate, desperation, esperance, prosper, prosperity, prosperous |
| spica | spike |  | spic- | spica | spica, spicate, spicose, spicosity, spicular, spiculate, spicule, spiculiform |
| spina | thorn |  | spin- | spina | infraspinate, infraspinatus, interspinal, spinal, spine, spinel, spinescent, spiniferous, spiniform, spinose, spinous |
| spirare | breathe |  | spir- | spirare | aspire, conspire, expire, inspire, perspire, respiration, spirit |
| spondere | a surety, guarantee; give assurance, promise solemnly |  | spond-, spons- | spondere, sponsus | correspond, correspondence, correspondent, corresponsive, cosponsor, despond, despondency, despondent, desponsage, desponsate, desponsation, disespouse, espousage, espousal, espouse, interspousal, irresponsibility, irresponsible, irresponsive, nonresponsive, respond, respondee, respondence, respondent, response, responsibility, responsible, responsion, responsive, responsivity, riposte, sponsal, sponsion, sponsional, sponsor, spousal, spouse |
| spuere | spew, spit |  | spu-, sput- | spuere | exspuition, sputum |
| squalere | scaly, dirty, filthy |  | squal- | squalere | squalid, squalidity, squalor |
| squama | scale |  | squam- | squama | squamous |
| squarrosus | spreading at tips |  | squarros- | squarrosus | squarrose |
| stagnare | pool of standing water |  | stagn- | stagnare | stagnant |
| stannum | tin |  | stann- | stannum | stannous |
| stare | stand | | st- | stare ”to stand“, also causative form statuere ”to enact, set“, from status ”condition, position“ | antestature, arrest, arrestant, arrestee, bistability, bistable, bistate, circumstance, circumstantial, consist, constable, constabulary, constancy, constant, constitute, consubstantiation, contrast, distance, distant, equidistance, equidistant, establish, estate, extant, inconstancy, inconstant, instability, instance, instant, obstacle, presto, stable, stamen, stamina, stance, stanchion, stanza, state, station, stationary, statistic, statue, status, staunch, stay, substance, substantial, substantiality, substantiate, substantiation, substantive, substate, substation, substitute, superstation, superstition, superstitious, transubstantiate, transubstantiation, tristate |
| statuere | stand | | statu-, -stitu- | statuere | institution, statute |
| stella | star | | stell- | stella | constellate, constellation, stellar |
| sternere | spread, strew | | stern-, strat- | sternere, stratus | consternation, prostrate, stratify, stratum, stratus, street |
| stilla | drip |  | still- | stilla, stillare | distillation, instill |
| stimulus | goad, rouse, excite |  | stimul- | stimulus | stimulate |
| stinare | stand | | stin- | stinare | destination, obstinate |
| stinguere | apart |  | stingu-, stinct- | stinguere | distinction, distinguish |
| strepere | noise |  | streper- | strepere | obstreperous |
| strigosus from striga | having stiff bristles |  | strigos- | strigosus from striga | strigose |
| stringere | tight, upright, stiff |  | string-, strict- | stringere, strictus | astringent, constrain, constrict, constringe, restrict, strain, strict, stringent |
| strix | compress |  | strig- | strix, strigis | strigogyps |
| struere | to make up, build |  | stru-, struct- | struere, structus | construct, construction, construe, destroy, destruct, instruct, obstruct, structure |
| studere | dedication |  | stud- | studere | étude, student |
| stupere | wonder |  | stup- | stupere | stupid, stupor |
| suadere | urge |  | suad-, suas- | suadere, suasus | persuasion |
| suavis | sweet |  | suav- | suavis | assuage, suave, suavity |
| subter | under |  | subter- | subter | subterfuge |
| sub | below |  | sub-, su-, suf-, sug-, sup-, sus- | sub | submarine, submerge, suffix, suggest, support |
| succarum | sugar |  | sucr- | succarum | sucrose |
| sudare | sweat |  | sud- | sudare | exudate, exude, sudarium, sudoriferous, transudate |
| suere | sew |  | su-, sut- | suere, sutus | couture, suture |
| sui | self |  | sui- | sui | sui generis, suicide |
| sulcus | furrow |  | sulc- | sulcus | sulcus |
| sumere | take |  | sum-, sumpt- | sumere, sumptus | assume, assumption, consume, consumption, presumption, subsume |
| summare | sum |  | sum- | summare ”to sum up“, from summa ”sum“ | consummate, consummation, sum, summa cum laude, summary, summation |
| super | above, over |  | super- | super | insuperable, soprano, sovereign, summit, superable, superb, supercilious, supercomputer, superficial, superfluous, superimpose, superior, superlative, supermarket, supernal, supernatural, supernova, superposition, superpower, superscript, supersede, supersonic, superstition, supervene, supervise, supreme, supremum, surname, surplus, surround, survive |
| supinus | lying back |  | supin- | supinus | supination, supine |
| supra | above, over |  | supra- | supra | supranationalism |
| surdus | deaf |  | surd- | surdus | absurdity |
| surgere | rise |  | surg- | surgere | insurgent, insurrection, resurgent, resurrection |
| sērus | late |  | ser- | sērus | serein, serotine, serotinous, serotiny, soiree |
