| ábax |  | abac | slab | ἄβαξ, ἄβακος (ábax, ábakos), ἀβακίσκος (abakískos) | abaciscus, abacus, abax |
| áke |  | ac-, acm-, acr-[3] | point | ἀκή (akḗ), ἀκίς, ἀκίδος (akís, akídos), ἀκόνη (akónē), ἄκρος (ákros), ἄκρον (ákron), ἄκρα | acidanthera, acme, acmeism, acmesthesia, acmic, acne |
| akeîsthai |  | ac-, ace-[4] | cure | ἀκεῖσθαι (akeîsthai), ἀκή (akḗ), ἄκος, ἄκεος (ákos, ákeos) | aceology, autacoid, panacea |
| Akádēmos |  | academ- | Akademos | Ἀκάδημος (Akádēmos) | academe, academia, academic, academy |
| ákantha |  | acanth- | thorn | ἀκή, ἄκανθα (ákantha) | Acanthaster, acanthion, acanthite, Acanthocephala, acanthocephaliasis, acanthocyte, Acanthomintha, Acanthosaura, Acanthus, Metriacanthosaurus, neuroacanthocytosis |
| akarí |  | acar-[5] | mite | ἀκαρί (akarí) | acariasis, acarid, acariphagous, acaroid, acarology, acarophobia, acarus |
| akros |  | acr- | height, summit, tip, top | ἀκή (akḗ), ἄκρος (ákros) “high”, “extreme”, ἄκρον (ákron) | acrobat, acrobatics, acrochordon, acromegalia, acromegaly, acromion, acronym, acrophobia, acropolis, acrostic, acroterion, acrotomophilia |
| aktís |  | actin-[6] | beam, ray | ἀκτίς, ἀκτῖνος (aktís, aktînos) | actinic, actinism, actinium, actinocerid, actinodrome, actinoid, actinomere, actinometer, actinomorphic, actinomyces, actinophryid, actinopod, Actinopterygii, actinotherapy, actinozoa |
| adḗn |  | aden-[8] | gland | ἀδήν, ἀδένος (adḗn, adénos) | adenocarcinoma, adenoid, adenoidectomy, adenology, adenoma, adenomyosis, adenosis |
| aeírein |  | aer- (ΑΕΡ)[9] | lift, raise | ἀείρειν (aeírein), ἀορτή (aortḗ), αἰρόμενον, ἀϝείρω | aorta, aortic, endaortitis, meteor, meteorology |
| aḗr |  | aer-, aero-[10] | air, atmosphere | ἀήρ, ἀέρος (aḗr, aéros) “air” | aerobic, aerodynamic, aeronautics, aeroplane, aerorrhachia, aerosol, aerotitis |
| aisthētós |  | aesth- | feeling, sensation | αἰσθητός (aisthētós), αἰσθητικός (aisthētikós) “of sense perception” from αἰσθάνεσθαι (aisthánesthai) “to perceive” | aesthesia, aesthesis, aesthete, aesthetics, anaesthetic, synesthesia |
| aíther | | aether-, ether- | upper pure, bright air | αἴθειν (aíthein), αἰθήρ (aithḗr) | ether, ethereal, etheric, hypaethros |
| ágein |  | ag-[11] | lead | ἄγειν (ágein) (cognate with Latin agere), ἀγωγός (agōgós) | agony, antagonist, antagonize, demagogue, pedagogue, pedagogy, strategy, synagogue |
| agápē |  | agap-[12] | love | ἀγάπη (agápē) | agape |
| agrós |  | agr-[13] | field | ἀγρός, ἀγροῦ (agrós, agroû) | agronomist, agronomy |
| aílouros |  | ailur-[14] | cat | αἴλουρος (aílouros) | Ailuroedus, ailuromancy, ailurophile, ailurophilia, ailurophobia |
| alkuṓn |  | alcyon-[15] | kingfisher | ἀλκυών, ἀλκυόνος (alkuṓn, alkuónos) | Halcyon, halcyon |
| áleuron |  | ale-[16] (ΑΛ) | wheat flour | ἀλέω, ἄλευρον (áleuron), ἀλείατα | aleuromancy, aleurone, aleuronic |
| álgos |  | alg-[17] | pain | ἄλγος (álgos), ἀλγεινός, ἀλγεῖν (algeîn), ἄλγησις (álgēsis) | analgesic, arthralgia, neuralgia, nostalgia |
| állos |  | all-[18] | other | ἄλλος (állos) | allegory, allogenic, allograph, allophone, parallactic, parallax |
| allḗlōn |  | allel-[19] | one another | ἀλλήλων (allḗlōn) | allele, allelomorph, allelotaxis, parallel, parallelism, parallelogon, parallelogram |
| álpha |  | alph-[20] | A, a | Α, α, ἄλφα (álpha) | alphabet, alphabetic, analphabetic, panalphabetic, polyalphabetic |
| alphós |  | alphit- | barley | ἀλφός (alphós), ἄλφιτον, ἀλφίτου (álphiton, alphítou) | alphitomancy |
| amath |  | amath- | sand | | amathophobia |
| amblús |  | ambly-[21] | dull | ἀμβλύς (amblús) | amblygeustia, amblygonite, amblyopia, Amblypoda |
| ámmos | | amm-[22] | sand | ἄμμος (ámmos), ἄμαθος (ámathos) | amathophobia, Ammophila |
| amnós |  | amn-[23] | lamb | ἀμνός (amnós), ἀμνεῖος, ἀμνειός, ἀμνίον (amníon) | amniocentesis, amnion, amnioscope, amniote, amniotic, anamniote |
| amphí |  | amph-, amphi-[24] | both, on both sides of, both kinds | ἀμφί (amphí) “on both sides” | amphibian, amphibious, amphibole, amphibolic, amphimacer, Amphipoda, amphistyly, amphitheatre, amphoterism |
| amugdálē |  | amygdal-[25] | almond | ἀμυγδάλη (amugdálē), ἀμύγδαλον (amúgdalon) | almond, amygdala, amygdale, amygdalin, amygdaloid, amygdule |
| an |  | an-, a-, am-, ar- | not, without | Greek ἀν-/ἀ- “not” | ambrosia, anaerobic, anarchy, anemia, anesthesia, anhydrous, anonymous, apathy, aphasia, arrhythmia, atheism, atypical |
| aná |  | ana-, am-, an-[26] | again, against, back, up | ἀνά (aná) | anagram, anabaptist, anaphylaxis, anarrhexis, anion, anode |
| anḗr |  | andr-[27] (ΑΝΕΡ) | male, masculine | ἀνήρ, ἀνδρός (anḗr, andrós), ἀνδρότης | Andrew, Alexander, androcentric, androcentrism, androgen, androgenous, androgyne, androgynous, androgyny, android, andrology, androphobia, androspore, diandry, misandry, monandry, philander, polyandrous, polyandry, protandry, pseudandry, synandrous |
| ánemos |  | anem-[28] (ΑΝ) | wind | ἄνεμος (ánemos) | anemograph, anemometer, anemometric, anemone, anemophilous, anemophily, anemophobia, anemoscope, anemotropism |
| antí | | ant-, anti-[29] | against, opposed to, preventive | ἀντί (antí) “against” | antagonist, antagonize, antibiotic, antibody, antichrist, antidepressant antidote, antifreeze, antifungal, antigen, antinomies, antipathy, antipodes, antirrhinum, antiseptic, antisocial, antithesis |
| antheîn |  | anth-[31] | flower | ἀνθεῖν (antheîn), ἄνθος (ánthos), ἄνθησις (ánthēsis), ἄνθημα (ánthēma), ἀνθηρός (anthērós) | anther, anthesis, Anthocoridae, anthodite, anthology, anthophobia, anthophore, Anthozoa, chrysanthemum, dianthus, enanthem, enanthema, exanthem, exanthematic, hydranth, hypanthium, perianth, zoanthid |
| ánthrax |  | anthrac- | coal | ἄνθραξ, ἄνθρακος (ánthrax, ánthrakos) | anthracite, anthracnose, anthracycline, anthrax |
| ánthrōpos |  | anthrop- | human | ἄνθρωπος (ánthrōpos) “man” | anthropology, anthroposophy, anthropomorphic, misanthrope, philanthropy |
| apó |  | ap-, apo-[32] | off, away from, separate, at the farthest point | ἀπό (apó) “from, away, un-, quite”, sometimes “changed, switched” | aphelion, apocrine, apocryphal, apogee, aporrhinosis, apostasy, apostate |
| Aphrodítē |  | aphrod- | Aphrodite | Ἀφροδίτη (Aphrodítē), Ἀφροδίσιος (Aphrodísios), ἀφροδισιακόν (aphrodisiakón) | aphrodisiac, pseudohermaphroditism |
| arákhnē |  | arachn- | spider | ἀράχνης, ἀράχνη (arákhnē) | Arachne, arachnid, arachnodactyly, arachnoid, arachnology, arachnophobia |
| árkhein |  | arch-, arche-, archi- | ruler | ἄρχειν (árkhein), ἄρχων (árkhōn), ἀρχή (arkhḗ) “rule” (in compounds: ἀρχε-, ἀρχι-) | anarchism, anarchist, anarchy, andrarchy, antarchy, archangel, archetype, architect, archon, autarch, autarchism, autarchy, eparch, eparchy, exarch, gynarchy, monarch, monarchism, monarchist, monarchy, navarch, octarchy, oligarchy, patriarchy, plutarchy, polyarchy, synarchism, synarchy, tetrarchy, triarchy, trierarch |
| arkhaîos |  | archae-, arche- | ancient | ἀρχαῖος (arkhaîos) “ancient” from ἀρχή (arkhḗ) “rule” | Archaea, archaeoastronomy, archaeology, archaic, archaism, archegonium, archeology |
| árktos |  | arct- | Relating to the North Pole or the region near it; relating to cold | ἄρκτος (árktos) “bear”, ἀρκτικός (arktikós) | Antarctic, arctic, Arctic Ocean, palearctic |
| aretḗ |  | aret- | virtue | ἀρετή, ἀρετῆς (aretḗ, aretês) | aretaic, arete |
| áristos |  | arist- | excellence | ἄριστος (áristos) | aristocracy, aristocrat |
| arithmós |  | arithm- | count, number | ἀριθμός (arithmós), ἀριθμέω, ἀριθμητικός (arithmētikós) | antilogarithm, arithmetic, arithmomania, logarithm, logarithmic |
| ársēn | | arsen-[33] | male | ἄρσην, ἄρσενος (ársēn, ársenos), ἀρσενικός (arsenikós) | arsenic, arsenopyrite |
| árthron |  | arthr- | joint | ἄρθρον (árthron) | anarthria, arthritic, arthritis, arthrogryposis, arthropathy, arthroplasty, arthropod, arthroscope, arthroscopic, arthroscopy, arthrosis, dysarthria, osteoarthritis, spondyloarthropathy |
| ártios |  | arti- | even | ἄρτιος (ártios), ἀρτιότης “evenness”, ἀρτιάκις | artiodactyl, artiodactylous |
| askós |  | asc-[34] | bag | ἀσκός (askós), ἀσκίδιον (askídion) | ascidium, ascites, ascitic, ascocarp, ascoma, ascomycete, Ascomycota, ascospore, ascus |
| áspros |  | aspr-[35] | white | ἄσπρος (áspros) | diaper |
| astḗr |  | aster-, astr- | star, star-shaped | ἀστήρ, ἀστέρος (astḗr, astéros), ἄστρον (ástron) “star” | aster, asterisk, asteroid, astrology, astronomy, astronaut, diasterism geaster, monaster |
| asthenḗs |  | asthen- | weak | ἀσθενής (asthenḗs) | asthenopia, asthenosphere, asthenozoospermia |
| athárē |  | ather-[36] | gruel | ἀθάρη (athárē) | atherogenic, atheroma, atherosclerosis |
| âthlos |  | athl- | contest | ἆθλος (âthlos) “contest, feat”, ἄεθλος | athlete, athletic, decathlon, pentathlon, triathlon |
| athroízein |  | -athroid- | gathered or lumped together | ἀθροίζειν (athroízein) “to gather together” | epiathroid, hypoathroid |
| aulētḗs |  | aul- | flute, tube | ἄημι (ἄϝημι), αὐλός (aulós), αὐλέω, αὔλησις, αὐλητής (aulētḗs) | aulete, aulos, hydraulic, hydraulus |
| autós |  | aut-, auto-[37] | self; directed from within | αὐτός (autós) “self”, “same” | autarchism, autarchy, autarky, authentic, autism, autistic, autobiography, autocracy, autograph, autoimmune, automatic, automaton, automobile, autonomy, autopilot |
| aúxein |  | aux-[38] | increase | αὔξειν (aúxein), αὐξάνειν auxánein, αὔξησις (aúxēsis), αὐξητικός (auxētikós) | auxanogram, auxanography, auxanology, auxanometer, auxesis, auxetic, auxin, auxochrome, auxology, auxotroph, auxotrophy |
| áxios |  | axi-[39] | merit, worth | ἄξιος (áxios) “worth” | axiology, axiom, axiomatic |
| áxōn |  | axon-[40] | axis, axle | ἄξων, ἄξονος (áxōn, áxonos) | axon, axonography, axonometric, axonotmesis |
