| concoct | (verb) make a concoction (of) by mixing | - |
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| (verb) devise or invent | Synonyms: dream up, hatch, think of, think up |
| (verb) prepare or cook by mixing ingredients | Synonyms: cook up |
| (verb) invent | Synonyms: trump up |
| concoction | (noun) the act of creating something (a medicine or drink or soup etc.) by compounding or mixing a variety of components | Synonyms: confection |
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| (noun) the invention of a scheme or story to suit some purpose | - |
| (noun) an occurrence of an unusual mixture | - |
| (noun) any foodstuff made by combining different ingredients | Synonyms: intermixture, mixture |
| decoct | (verb) extract the essence of something by boiling it | - |
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| (verb) steep in hot water | - |
| (verb) be cooked until very little liquid is left | Synonyms: boil down, concentrate, reduce |
| decoction | (noun) (pharmacology) the extraction of water-soluble drug substances by boiling | - |
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| 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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| doctrinaire | (adjective) stubbornly insistent on theory without regard for practicality or suitability | - |
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| (noun) a stubborn person of arbitrary or arrogant opinions | Synonyms: dogmatist |
| doctrinal | (adjective) relating to or involving or preoccupied with doctrine | - |
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| doctrinally | (adverb) as a matter of doctrine | - |
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| doctrine | (noun) a belief (or system of beliefs) accepted as authoritative by some group or school | Synonyms: ism, philosophical system, philosophy, school of thought |
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| ectoproct | (noun) sessile mossy aquatic animal having the anus of the polyp outside the crown of tentacles | - |
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| entoproct | (noun) any of various moss-like aquatic animals usually forming branching colonies; each polyp having a both mouth and anus within a closed ring of tentacles | - |
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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 | - |
| (noun) the great circle on the celestial sphere midway between the celestial poles | Synonyms: celestial equator, equinoctial circle, equinoctial line |
| indoctrinate | (verb) teach doctrines to; teach uncritically | - |
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| indoctrination | (noun) teaching someone to accept doctrines uncritically | - |
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| noctambulation | (noun) walking by a person who is asleep | Synonyms: noctambulism, sleepwalking, somnambulation, somnambulism |
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| noctambulism | (noun) walking by a person who is asleep | Synonyms: noctambulation, sleepwalking, somnambulation, somnambulism |
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| noctambulist | (noun) someone who walks about in their sleep | Synonyms: sleepwalker, somnambulist |
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| noctiluca | (noun) large bioluminescent marine protozoan | Synonyms: Noctiluca miliaris |
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| noctilucent | (adjective) shining or glowing by night | - |
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| noctuid | (noun) usually dull-colored medium-sized nocturnal moth; the usually smooth-bodied larvae are destructive agricultural pests | Synonyms: noctuid moth, owlet moth |
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| nocturia | (noun) excessive urination at night; especially common in older men | Synonyms: nycturia |
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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 | - |
| nocturnally | (adverb) at night | - |
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| nocturne | (noun) a pensive lyrical piece of music (especially for the piano) | Synonyms: notturno |
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| octad | (noun) the cardinal number that is the sum of seven and one | Synonyms: 8, eight, eighter, eighter from Decatur, octet, octonary, ogdoad, VIII |
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| octagon | (noun) an eight-sided polygon | - |
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| octagonal | (adjective) of or relating to or shaped like an octagon | Synonyms: octangular |
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| octahedron | (noun) any polyhedron having eight plane faces | - |
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| octal | (adjective) of or pertaining to a number system having 8 as its base | - |
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| octameter | (noun) a verse line having eight metrical feet | - |
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| octane | (noun) any isomeric saturated hydrocarbon found in petroleum and used as a fuel and solvent | - |
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| octangular | (adjective) of or relating to or shaped like an octagon | Synonyms: octagonal |
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| octant | (noun) a measuring instrument for measuring angles to a celestial body; similar to a sextant but with 45 degree calibration | - |
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| octave | (noun) a musical interval of eight tones | Synonyms: musical octave |
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| (noun) a rhythmic group of eight lines of verse | - |
| (noun) a feast day and the seven days following it | - |
| octavo | (noun) the size of a book whose pages are made by folding a sheet of paper three times to form eight leaves | Synonyms: 8vo, eightvo |
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| octet | (noun) a musical composition written for eight performers | Synonyms: octette |
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| (noun) eight people considered as a unit | Synonyms: eightsome, octette |
| (noun) a set of eight similar things considered as a unit | Synonyms: octette |
| (noun) eight performers or singers who perform together | Synonyms: octette |
| (noun) the cardinal number that is the sum of seven and one | Synonyms: 8, eight, eighter, eighter from Decatur, octad, octonary, ogdoad, VIII |
| octette | (noun) a musical composition written for eight performers | Synonyms: octet |
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| (noun) eight people considered as a unit | Synonyms: eightsome, octet |
| (noun) a set of eight similar things considered as a unit | Synonyms: octet |
| (noun) eight performers or singers who perform together | Synonyms: octet |
| octillion | (noun) the number that is represented as a one followed by 27 zeros | - |
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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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| octroi | (noun) a tax on various goods brought into a town | - |
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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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| (noun) a grant that funds postdoctoral study or research | Synonyms: post doc, postdoc |
| proctalgia | (noun) pain in the rectum | - |
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| proctitis | (noun) inflammation of the rectum; marked by bloody stools and a frequent urge to defecate; frequently associated with Crohn's disease or ulcerative colitis | - |
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| 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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| protoctist | (noun) any of the unicellular protists | - |
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| rhizoctinia | (noun) any fungus now or formerly belonging to the form genus Rhizoctinia | - |
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