| doctoral | (adjective) of or relating to a doctor or doctorate | Synonyms: doctorial |
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| doctorial | (adjective) of or relating to a doctor or doctorate | Synonyms: doctoral |
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| doctrinaire | (adjective) stubbornly insistent on theory without regard for practicality or suitability | - |
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| doctrinal | (adjective) relating to or involving or preoccupied with doctrine | - |
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| equinoctial | (adjective) relating to an equinox (when the lengths of night and day are equal) | - |
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| (adjective) relating to the vicinity of the equator | - |
| noctilucent | (adjective) shining or glowing by night | - |
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| nocturnal | (adjective) belonging to or active during the night | - |
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| (adjective) of or relating to or occurring in the night | - |
| octagonal | (adjective) of or relating to or shaped like an octagon | Synonyms: octangular |
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| octal | (adjective) of or pertaining to a number system having 8 as its base | - |
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| octangular | (adjective) of or relating to or shaped like an octagon | Synonyms: octagonal |
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| octogenarian | (adjective) being from 80 to 89 years old | - |
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| octosyllabic | (adjective) having or characterized by or consisting of eight syllables | - |
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| octuple | (adjective) having eight units or components | Synonyms: eight-fold, eightfold |
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| postdoctoral | (adjective) of or relating to study or research that is done after work for the doctoral degree has been completed | - |
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