| octogenarian | (adjective) being from 80 to 89 years old | - |
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| (noun) someone whose age is in the eighties | - |
| octonary | (noun) the cardinal number that is the sum of seven and one | Synonyms: 8, eight, eighter, eighter from Decatur, octad, octet, ogdoad, VIII |
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| octopod | (noun) a cephalopod with eight arms but lacking an internal shell | - |
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| octopus | (noun) bottom-living cephalopod having a soft oval body with eight long tentacles | Synonyms: devilfish |
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| (noun) tentacles of octopus prepared as food | - |
| octoroon | (noun) an offspring of a quadroon and a white parent; a person who is one-eighth black | - |
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| octosyllabic | (adjective) having or characterized by or consisting of eight syllables | - |
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| octosyllable | (noun) a verse line having eight syllables or a poem of octosyllabic lines | - |
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