| doctor | (noun) children take the roles of physician or patient or nurse and pretend they are at the physician's office | - |
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| (noun) a licensed medical practitioner | Synonyms: doc, Dr., MD, medico, physician |
| (noun) a person who holds Ph.D. degree (or the equivalent) from an academic institution | Synonyms: Dr. |
| (verb) give medical treatment to | - |
| (verb) alter and make impure, as with the intention to deceive | Synonyms: doctor up, sophisticate |
| (verb) restore by replacing a part or putting together what is torn or broken | Synonyms: bushel, fix, furbish up, mend, repair, restore, touch on |
| doctoral | (adjective) of or relating to a doctor or doctorate | Synonyms: doctorial |
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| doctorate | (noun) one of the highest earned academic degrees conferred by a university | Synonyms: doctor's degree |
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| doctorfish | (noun) surgeon fish of the West Indies | Synonyms: Acanthurus chirurgus, doctor-fish |
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| doctorial | (adjective) of or relating to a doctor or doctorate | Synonyms: doctoral |
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| doctorspeak | (noun) medical jargon | - |
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| 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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| 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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| (noun) a grant that funds postdoctoral study or research | Synonyms: post doc, postdoc |
| proctocele | (noun) protrusion or herniation of the rectum into the vagina; can occur if pelvic muscles are weakened by childbirth | Synonyms: rectocele |
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| proctologist | (noun) a doctor specializing in diseases of the rectum and anus | - |
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| proctology | (noun) the branch of medicine dealing with the diagnosis and treatment of disorders of the colon or rectum or anus | - |
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| proctoplasty | (noun) reconstructive surgery of the anus or rectum | Synonyms: rectoplasty |
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| proctor | (noun) someone who supervises (an examination) | Synonyms: monitor |
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| (verb) watch over (students taking an exam, to prevent cheating) | Synonyms: invigilate |
| proctorship | (noun) the position of proctor | - |
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| proctoscope | (noun) an endoscope for examining the rectum | - |
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| proctoscopy | (noun) visual examination of the rectum and the end of the colon by means of a proctoscope | - |
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