| Words | Parts of Speech | Meaning/Definition/Similar Words |
|---|---|---|
| octa- | A prefix meaning eight. See Octo-., A combining form meaning eight; as in octodecimal, octodecimal, octolocular. | |
| octad | noun | An atom or radical which has a valence of eight, or is octavalent. |
| octet | noun | A composition for eight parts, usually for eight solo instruments or voices. |
| octic | adjective | Of the eighth degree or order., A quantic of the eighth degree. |
| octo- | Alt. of Octa- | |
| octyl | noun | A hypothetical hydrocarbon radical regarded as an essential residue of octane, and as entering into its derivatives; as, octyl alcohol. |