| Word | Definitions | Synonyms |
|---|---|---|
| octagonal | (adjective) of or relating to or shaped like an octagon | Synonyms: octangular |
| octal | (adjective) of or pertaining to a number system having 8 as its base | - |
| octangular | (adjective) of or relating to or shaped like an octagon | Synonyms: octagonal |
| octogenarian | (adjective) being from 80 to 89 years old | - |
| octosyllabic | (adjective) having or characterized by or consisting of eight syllables | - |
| octuple | (adjective) having eight units or components | Synonyms: eight-fold, eightfold |