| octastichous |
| octastyle |
| Octateuch |
| octaval |
| octavarium |
| octavd |
| Octavia |
| Octavian |
| octavina |
| Octavius |
| octavos |
| Octavus |
| octects |
| octenary |
| octennially |
| octet |
| octettes |
| octic |
| octylene |
| octillion |
| octyls |
| octine |
| octo- |
| octoad |
| octobass |
| October |
| Octobrist |
| octocentenary |
| Octocoralla |
| octocorallan |
| octocotyloid |
| octodactyl |
| octode |
| octodecillion |
| octodecimal |
| octodecimo |
| octodianome |
| Octodon |
| Octodontinae |
| octoechos |
| octofoiled |
| octogamy |
| octogenarianism |
| octogenarians |
| Octogynia |
| octogynian |
| octoglot |
| octohedral |
| octoyl |
| octolateral |
| octomerous |
| octometer |
| octonary |
| octonarian |
| octonematous |
| octonion |
| octopartite |
| octopean |
| octopetalous |
| octophyllous |
| octopine |
| octoploid |
| octopod |
| Octopoda |
| octopodous |
| octopods |
| octopuses |
| octoradial |
| octoreme |
| octoroon |
| octosepalous |
| octosyllabic |
| octospore |
| octosporous |
| octothorpe |
| octothorpes |
| octroy |
| octrois |
| octuple |
| octupled |
| octuplets |
| octuplex |
| octuplication |
| octupling |
| ocul- |
| ocular |
| ocularly |
| oculars |
| oculauditory |
| oculi |
| oculigerous |
| Oculina |
| oculinoid |
| oculist |
| oculli |
| oculo- |
| oculofrontal |
| oculomotor |
| oculopalpebral |
| oculopupillary |