| acold | (adjective) of persons; feeling cold | - |
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| acolyte | (noun) someone who assists a priest or minister in a liturgical service; a cleric ordained in the highest of the minor orders in the Roman Catholic Church but not in the Anglican Church or the Eastern Orthodox Churches | - |
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| aconite | (noun) any of various usually poisonous plants of the genus Aconitum having tuberous roots and palmately lobed leaves and blue or white flowers | - |
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| acorea | (noun) absence of the pupil in an eye | - |
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| acorn | (noun) fruit of the oak tree: a smooth thin-walled nut in a woody cup-shaped base | - |
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| acousma | (noun) illusory auditory perception of strange nonverbal sounds | Synonyms: auditory hallucination |
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| acoustic | (adjective) of or relating to the science of acoustics | Synonyms: acoustical |
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| (noun) a remedy for hearing loss or deafness | - |
| acoustical | (adjective) of or relating to the science of acoustics | Synonyms: acoustic |
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| acoustically | (adverb) with respect to acoustics | - |
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| acoustician | (noun) a physicist who specializes in acoustics | - |
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| acousticophobia | (noun) a morbid fear of sounds including your own voice | Synonyms: phonophobia |
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| acoustics | (noun) the study of the physical properties of sound | - |
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| albacore | (noun) large pelagic tuna the source of most canned tuna; reaches 93 pounds and has long pectoral fins; found worldwide in tropical and temperate waters | Synonyms: long-fin tunny, Thunnus alalunga |
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| (noun) relatively small tuna with choice white flesh; major source of canned tuna | - |
| anacoluthia | (noun) an abrupt change within a sentence from one syntactic structure to another | Synonyms: anacoluthon |
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| anacoluthic | (adjective) of or related to syntactic inconsistencies of the sort known as anacoluthons | - |
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| anacoluthon | (noun) an abrupt change within a sentence from one syntactic structure to another | Synonyms: anacoluthia |
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| anaconda | (noun) large arboreal boa of tropical South America | Synonyms: Eunectes murinus |
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| anthracosis | (noun) lung disease caused by inhaling coal dust | Synonyms: black lung, black lung disease, coal miner's lung |
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| aplacophoran | (noun) deep-water wormlike mollusks lacking calcareous plates on the body but having fine slimy spicules on the covering mantle | Synonyms: solenogaster |
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| archdeacon | (noun) (Anglican Church) an ecclesiastical dignitary usually ranking just below a bishop | - |
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| archdeaconry | (noun) the territorial jurisdiction of an archdeacon | - |
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| archidiaconal | (adjective) of or relating to an archdeacon or his office | - |
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| archidiaconate | (noun) office or position of an archdeacon | - |
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| autacoid | (noun) any physiologically active internal secretion especially one of uncertain classification | Synonyms: autocoid |
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| autacoidal | (adjective) of or relating to an autacoid | - |
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| bacon | (noun) back and sides of a hog salted and dried or smoked; usually sliced thin and fried | - |
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| barracouta | (noun) a large marine food fish common on the coasts of Australia, New Zealand, and southern Africa | Synonyms: snoek |
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| beacon | (noun) a radio station that broadcasts a directional signal for navigational purposes | Synonyms: radio beacon |
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| (noun) a tower with a light that gives warning of shoals to passing ships | Synonyms: beacon light, lighthouse, pharos |
| (noun) a fire (usually on a hill or tower) that can be seen from a distance | Synonyms: beacon fire |
| (verb) guide with a beacon | - |
| (verb) shine like a beacon | - |
| cacodaemon | (noun) an evil spirit | Synonyms: cacodemon |
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| cacodaemonic | (adjective) of or relating to evil spirits | Synonyms: cacodemonic |
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| cacodemon | (noun) an evil spirit | Synonyms: cacodaemon |
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| cacodemonic | (adjective) of or relating to evil spirits | Synonyms: cacodaemonic |
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| cacodyl | (noun) the univalent group derived from arsine | Synonyms: arsenic group, cacodyl group, cacodyl radical |
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| (noun) a poisonous oily liquid with a garlicky odor composed of 2 cacodyl groups; undergoes spontaneous combustion in dry air | Synonyms: tetramethyldiarsine |
| cacodylic | (adjective) of or relating to cacodyl | - |
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| cacoethes | (noun) an irrational but irresistible motive for a belief or action | Synonyms: mania, passion |
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| cacogenesis | (noun) inability to produce hybrids that are both viable and fertile | - |
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| cacogenic | (adjective) pertaining to or causing degeneration in the offspring produced | Synonyms: dysgenic |
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| cacogenics | (noun) the study of the operation of factors causing degeneration in the type of offspring produced | Synonyms: dysgenics |
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| cacography | (noun) poor handwriting | Synonyms: scratch, scrawl, scribble |
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| cacomistle | (noun) raccoon-like omnivorous mammal of Mexico and the southwestern United States having a long bushy tail with black and white rings | Synonyms: Bassariscus astutus, bassarisk, cacomixle, civet cat, coon cat, miner's cat, raccoon fox, ring-tailed cat, ringtail |
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| cacomixle | (noun) raccoon-like omnivorous mammal of Mexico and the southwestern United States having a long bushy tail with black and white rings | Synonyms: Bassariscus astutus, bassarisk, cacomistle, civet cat, coon cat, miner's cat, raccoon fox, ring-tailed cat, ringtail |
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| cacophonic | (adjective) having an unpleasant sound | Synonyms: cacophonous |
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| cacophonous | (adjective) having an unpleasant sound | Synonyms: cacophonic |
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| cacophony | (noun) loud confusing disagreeable sounds | - |
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| (noun) a loud harsh or strident noise | Synonyms: blare, blaring, clamor, din |
| caracole | (verb) make a half turn on a horse, in dressage | - |
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| caracolito | (noun) large Costa Rican tree having light-colored wood suitable for cabinetry; similar to the African lepidobotrys in wood structure as well as in fruit and flowers and leaves and seeds; often classified in other families | Synonyms: Ruptiliocarpon caracolito |
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| catacomb | (noun) an underground tunnel with recesses where bodies were buried (as in ancient Rome) | - |
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| catacorner | (adjective) slanted across a polygon on a diagonal line | Synonyms: cata-cornered, cater-cornered, catercorner, catty-corner, catty-cornered, kitty-corner, kitty-cornered |
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| chawbacon | (noun) a person who is not very intelligent or interested in culture | Synonyms: bumpkin, hayseed, hick, rube, yahoo, yokel |
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| curacoa | (noun) flavored with sour orange peel | Synonyms: curacao |
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| dacoit | (noun) a member of an armed gang of robbers | Synonyms: dakoit |
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| dacoity | (noun) robbery by a gang of armed dacoits | Synonyms: dakoity |
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| deacon | (noun) a cleric ranking just below a priest in Christian churches; one of the Holy Orders | - |
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| (noun) a Protestant layman who assists the minister | Synonyms: Protestant deacon |
| deaconess | (noun) a woman deacon | - |
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| dracontium | (noun) any plant of the genus Dracontium; strongly malodorous tropical American plants usually with gigantic leaves | - |
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| guanaco | (noun) wild llama | Synonyms: Lama guanicoe |
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| icaco | (noun) plum-shaped whitish to almost black fruit used for preserves; tropical American | Synonyms: coco plum, cocoa plum |
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| (noun) small tropical American tree bearing edible plumlike fruit | Synonyms: Chrysobalanus icaco, coco plum, coco plum tree, cocoa plum |
| itraconazole | (noun) an oral antifungal drug (trade name Sporanox) taken for cases of fungal nail disease | Synonyms: Sporanox |
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| jaconet | (noun) a lightweight cotton cloth with a smooth and slightly stiff finish; used for clothing and bandages | - |
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| laconic | (adjective) brief and to the point; effectively cut short | Synonyms: crisp, curt, terse |
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| laconically | (adverb) in a dry laconic manner | Synonyms: drily, dryly |
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| laconicism | (noun) terseness of expression | Synonyms: laconism |
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| laconism | (noun) terseness of expression | Synonyms: laconicism |
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| limacoid | (adjective) of or resembling a slug | Synonyms: limacine |
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| macon | (noun) fine Burgundy wine usually white and dry | Synonyms: maconnais |
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| maconnais | (noun) fine Burgundy wine usually white and dry | Synonyms: macon |
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| malacologist | (noun) a zoologist specializing in the study of mollusks | - |
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| malacology | (noun) the branch of zoology that studies the structure and behavior of mollusks | - |
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| malacophily | (noun) (botany) pollination of plants by snails. | - |
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| malacopterygian | (noun) any fish of the superorder Malacopterygii | Synonyms: soft-finned fish |
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| megacolon | (noun) an abnormal enlargement of the colon; can be congenital (as in Hirschsprung's disease) or acquired (as when children refuse to defecate) | - |
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| ostracod | (noun) tiny marine and freshwater crustaceans with a shrimp-like body enclosed in a bivalve shell | Synonyms: mussel shrimp, seed shrimp |
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| ostracoderm | (noun) extinct fish-like jawless vertebrate having a heavily armored body; of the Paleozoic | - |
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| paracosm | (noun) a prolonged fantasy world invented by children; can have a definite geography and language and history | - |
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| peacoat | (noun) a sailor's heavy woolen double-breasted jacket | Synonyms: pea jacket |
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| peacock | (noun) male peafowl; having a crested head and very large fanlike tail marked with iridescent eyes or spots | - |
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| (noun) European butterfly having reddish-brown wings each marked with a purple eyespot | Synonyms: Inachis io, peacock butterfly |
| phacoemulsification | (noun) extracapsular surgery for cataracts in which ultrasonic sound breaks the cortex and nucleus of the lens into small fragments that are then vacuumed away through a small tube | - |
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| pharmacogenetics | (noun) the branch of genetics that studies the genetically determined variations in responses to drugs in humans or laboratory organisms | - |
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| pharmacokinetics | (noun) the study of the action of drugs in the body: method and rate of excretion, duration of effect, etc. | - |
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| pharmacologic | (adjective) of or relating to pharmacology | Synonyms: pharmacological |
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| pharmacological | (adjective) of or relating to pharmacology | Synonyms: pharmacologic |
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| pharmacologically | (adverb) with regard to pharmacology | - |
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| pharmacologist | (noun) someone trained in the science of drugs (their composition and uses and effects) | Synonyms: pharmaceutical chemist |
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| pharmacology | (noun) the science or study of drugs: their preparation and properties and uses and effects | Synonyms: materia medica, pharmacological medicine |
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| pharmacopeia | (noun) (pharmacology) a book containing a compilation of pharmaceutical products with their formulas and methods of preparation | Synonyms: formulary |
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| pharmacopoeia | (noun) a collection or stock of drugs | - |
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| phenacomys | (noun) any of several vole-like terrestrial or arboreal rodents of cold forested regions of Canada and western United States | - |
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| phragmacone | (noun) the thin conical chambered internal shell (either straight or curved) of a belemnite | Synonyms: phragmocone |
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| placoderm | (noun) fish-like vertebrate with bony plates on head and upper body; dominant in seas and rivers during the Devonian; considered the earliest vertebrate with jaws | - |
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| placoid | (adjective) as the hard flattened scales of e.g. sharks | Synonyms: platelike |
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| polyplacophore | (noun) primitive elongated bilaterally symmetrical marine mollusk having a mantle covered with eight calcareous plates | Synonyms: chiton, coat-of-mail shell, sea cradle |
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| psittacosaur | (noun) primitive dinosaur actually lacking horns and having only the beginning of a frill; long hind limbs and short forelimbs; may have been bipedal | Synonyms: psittacosaurus |
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| psittacosaurus | (noun) primitive dinosaur actually lacking horns and having only the beginning of a frill; long hind limbs and short forelimbs; may have been bipedal | Synonyms: psittacosaur |
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| psittacosis | (noun) infectious disease of birds | Synonyms: parrot disease |
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| (noun) an atypical pneumonia caused by a rickettsia microorganism and transmitted to humans from infected birds | Synonyms: ornithosis, parrot fever |
| psychopharmacological | (adjective) of or relating to psychopharmacology | - |
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| psychopharmacology | (noun) the study of drugs that affect the mind | - |
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| racon | (noun) a device that, on receiving radar signals, transmits coded signals in response to help navigators determine their position | Synonyms: radar beacon |
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| raconteur | (noun) a person skilled in telling anecdotes | Synonyms: anecdotist |
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| racoon | (noun) an omnivorous nocturnal mammal native to North America and Central America | Synonyms: raccoon |
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| seacoast | (noun) the shore of a sea or ocean | Synonyms: coast, sea-coast, seashore |
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