2D PASSAGE
2D PHYSICAL
| passage |  | ||
| highway |  | ||
| street |  | ||
| road |  | ||
| route |  | ||
| track |  | tract | |
| way |  | ||
| tunnel | |||
| cylinder |  | ||
| pipe | wind pipe , food pipe | ||
| maze | - aqueduct |
2D ORGANIC
| sinus | |||
| drainage | |||
| vessel |  | blood vessel , lymph vessel | |
| artery |  | ||
| vein |  | ||
| duct | - canaliculi | ||
| canal | |||
| vessel - | |||
| gullet - | food gullet , oesophagus | ||
| meatus | |||
| sinus | |||
| shunt | |||
| anastomosis | |||
| fistula | |||