| aquacultural | (adjective) of or relating to aquiculture | Synonyms: aquicultural, hydroponic |
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| aquaculture | (noun) rearing aquatic animals or cultivating aquatic plants for food | - |
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| aquicultural | (adjective) of or relating to aquiculture | Synonyms: aquacultural, hydroponic |
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| aquiculture | (noun) a technique of growing plants (without soil) in water containing dissolved nutrients | Synonyms: hydroponics, tank farming |
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| arbitrageur | (noun) someone who engages in arbitrage (who purchases securities in one market for immediate resale in another in the hope of profiting from the price differential) | Synonyms: arb, arbitrager |
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| arboriculture | (noun) the tending of and caring for trees | Synonyms: tree farming |
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| arboriculturist | (noun) someone trained in forestry | Synonyms: forester, tree farmer |
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| arbour | (noun) a framework that supports climbing plants | Synonyms: arbor, bower, pergola |
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| architectural | (adjective) of or pertaining to the art and science of architecture | - |
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| architecturally | (adverb) with regard to architecture | - |
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| architecture | (noun) the profession of designing buildings and environments with consideration for their esthetic effect | - |
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| (noun) an architectural product or work | - |
| (noun) (computer science) the structure and organization of a computer's hardware or system software | Synonyms: computer architecture |
| (noun) the discipline dealing with the principles of design and construction and ornamentation of fine buildings | - |
| archosaur | (noun) extinct reptiles including: dinosaurs, plesiosaurs, pterosaurs, ichthyosaurs, thecodonts | Synonyms: archosaurian, archosaurian reptile |
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| archosaurian | (adjective) of or relating to reptiles of the subclass Archosauria | - |
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| (noun) extinct reptiles including: dinosaurs, plesiosaurs, pterosaurs, ichthyosaurs, thecodonts | Synonyms: archosaur, archosaurian reptile |
| ardour | (noun) intense feeling of love | Synonyms: ardor |
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| (noun) a feeling of strong eagerness (usually in favor of a person or cause) | Synonyms: ardor, elan, zeal |
| (noun) feelings of great warmth and intensity | Synonyms: ardor, fervency, fervidness, fervor, fervour, fire |
| argentinosaur | (noun) huge herbivorous dinosaur of Cretaceous found in Argentina | - |
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| armature | (noun) coil in which voltage is induced by motion through a magnetic field | - |
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| armour | (noun) tough more-or-less rigid protective covering of an animal or plant | Synonyms: armor |
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| (noun) protective covering made of metal and used in combat | Synonyms: armor |
| (noun) a military unit consisting of armored fighting vehicles | Synonyms: armor |
| (verb) equip with armor | Synonyms: armor |
| armoured | (adjective) protected by armor (used of persons or things military) | Synonyms: armored |
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| (adjective) used of animals; provided with protective covering | Synonyms: armored |
| armourer | (noun) a manufacturer of firearms | Synonyms: armorer |
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| (noun) an enlisted man responsible for the upkeep of small arms and machine guns etc. | Synonyms: armorer, artificer |
| (noun) a worker skilled in making armor or arms | Synonyms: armorer |
| armoury | (noun) a place where arms are manufactured | Synonyms: armory, arsenal |
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| (noun) a military structure where arms and ammunition and other military equipment are stored and training is given in the use of arms | Synonyms: armory, arsenal |
| (noun) all the weapons and equipment that a country has | Synonyms: armory, arsenal |
| (noun) a collection of resources | Synonyms: armory, inventory |
| assurance | (noun) freedom from doubt; belief in yourself and your abilities | Synonyms: authority, confidence, self-assurance, self-confidence, sureness |
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| (noun) a statement intended to inspire confidence | - |
| (noun) a binding commitment to do or give or refrain from something | Synonyms: pledge |
| (noun) a British term for some kinds of insurance | - |
| assure | (verb) be careful or certain to do something; make certain of something | Synonyms: ascertain, check, control, ensure, insure, see, see to it |
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| (verb) inform positively and with certainty and confidence | Synonyms: tell |
| (verb) assure somebody of the truth of something with the intention of giving the listener confidence | - |
| (verb) make a promise or commitment | Synonyms: promise |
| (verb) make certain of | Synonyms: ensure, guarantee, insure, secure |
| assured | (adjective) marked by assurance; exhibiting confidence | - |
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| (adjective) characterized by certainty or security | - |
| assuredly | (adverb) without a doubt | - |
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| assuredness | (noun) great coolness and composure under strain | Synonyms: aplomb, cool, poise, sang-froid |
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| assurgent | (adjective) growing or extending upward | - |
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| (adjective) rising from the sea | - |
| assuring | (adjective) giving confidence | - |
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| auburn | (adjective) (of hair) colored a moderate reddish-brown | - |
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| augur | (noun) (ancient Rome) a religious official who interpreted omens to guide public policy | Synonyms: auspex |
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| (verb) indicate, as with a sign or an omen | Synonyms: auspicate, betoken, bode, forecast, foreshadow, foretell, omen, portend, predict, prefigure, presage, prognosticate |
| (verb) predict from an omen | - |
| augury | (noun) an event that is experienced as indicating important things to come | Synonyms: foretoken, preindication, sign |
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| aura | (noun) an indication of radiant light drawn around the head of a saint | Synonyms: aureole, gloriole, glory, halo, nimbus |
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| (noun) a distinctive but intangible quality surrounding a person or thing | Synonyms: air, atmosphere |
| (noun) a sensation (as of a cold breeze or bright light) that precedes the onset of certain disorders such as a migraine attack or epileptic seizure | - |
| aural | (adjective) relating to or characterized by an aura | - |
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| (adjective) of or pertaining to hearing or the ear | - |
| aurally | (adverb) with regard to sound or the ear | - |
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| aureate | (adjective) having the deep slightly brownish color of gold | Synonyms: gilded, gilt, gold, golden |
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| (adjective) elaborately or excessively ornamented | Synonyms: flamboyant, florid |
| aureole | (noun) an indication of radiant light drawn around the head of a saint | Synonyms: aura, gloriole, glory, halo, nimbus |
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| (noun) the outermost region of the sun's atmosphere; visible as a white halo during a solar eclipse | Synonyms: corona |
| auric | (adjective) of or relating to or containing or derived from gold | Synonyms: aurous |
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| auricle | (noun) a small conical pouch projecting from the upper anterior part of each atrium of the heart | Synonyms: atrial auricle, auricula atrii |
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| (noun) the externally visible cartilaginous structure of the external ear | Synonyms: ear, pinna |
| auricula | (noun) a pouch projecting from the top front of each atrium of the heart | Synonyms: auricular appendage, auricular appendix |
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| (noun) yellow-flowered primrose native to Alps; commonly cultivated | Synonyms: bear's ear, Primula auricula |
| auricular | (adjective) of or relating to near the ear | Synonyms: otic |
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| (adjective) pertaining to an auricle of the heart | - |
| (adjective) relating to or perceived by or shaped like the organ of hearing | - |
| auriculare | (noun) the craniometric point at the center of the opening of the external acoustic meatus | Synonyms: auricular point |
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| auriculate | (adjective) having auricles | Synonyms: auriculated |
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| auriculated | (adjective) having auricles | Synonyms: auriculate |
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| auriculoventricular | (adjective) relating to or affecting the atria and ventricles of the heart | Synonyms: atrioventricular |
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| auriferous | (adjective) containing gold | Synonyms: gold-bearing |
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| auriform | (adjective) having a shape resembling an ear | Synonyms: ear-like, ear-shaped |
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| aurify | (verb) turn golden | - |
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| (verb) transform into gold | - |
| auriscope | (noun) medical instrument consisting of a magnifying lens and light; used for examining the external ear (the auditory meatus and especially the tympanic membrane) | Synonyms: auroscope, otoscope |
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| aurochs | (noun) large recently extinct long-horned European wild ox; considered one of the ancestors of domestic cattle | Synonyms: Bos primigenius, urus |
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| (noun) European bison having a smaller and higher head than the North American bison | Synonyms: Bison bonasus, wisent |
| aurora | (noun) an atmospheric phenomenon consisting of bands of light caused by charged solar particles following the earth's magnetic lines of force | - |
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| (noun) the first light of day | Synonyms: break of day, break of the day, cockcrow, dawn, dawning, daybreak, dayspring, first light, morning, sunrise, sunup |
| auroral | (adjective) characteristic of the dawn | Synonyms: aurorean |
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| (adjective) of or relating to the atmospheric phenomenon auroras | - |
| aurorean | (adjective) characteristic of the dawn | Synonyms: auroral |
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| auroscope | (noun) medical instrument consisting of a magnifying lens and light; used for examining the external ear (the auditory meatus and especially the tympanic membrane) | Synonyms: auriscope, otoscope |
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| aurous | (adjective) of or relating to or containing or derived from gold | Synonyms: auric |
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| auteur | (noun) a filmmaker who has a personal style and keeps creative control over his or her works | - |
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| aventurine | (noun) a translucent quartz spangled with bits of mica or other minerals | Synonyms: sunstone |
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| azoturia | (noun) excess of urea in the urine | - |
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| azure | (adjective) of a deep somewhat purplish blue color similar to that of a clear October sky | Synonyms: bright blue, cerulean, sky-blue |
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| (noun) a light shade of blue | Synonyms: cerulean, lazuline, sapphire, sky-blue |
| (verb) color azure | - |
| azurite | (noun) blue carbonate of copper; blue malachite | - |
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| baccalaureate | (noun) an academic degree conferred on someone who has successfully completed undergraduate studies | Synonyms: bachelor's degree |
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| (noun) a farewell sermon to a graduating class at their commencement ceremonies | - |
| barbiturate | (noun) organic compound having powerful soporific effect; overdose can be fatal | - |
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| barnburner | (noun) an impressively successful event | - |
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| (noun) someone who burns down a barn | - |
| barosaur | (noun) a dinosaur that could grow to be as tall as a building five stories tall | Synonyms: barosaurus |
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| barosaurus | (noun) a dinosaur that could grow to be as tall as a building five stories tall | Synonyms: barosaur |
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| beefburger | (noun) a sandwich consisting of a fried cake of minced beef served on a bun, often with other ingredients | Synonyms: burger, hamburger |
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| behaviour | (noun) manner of acting or controlling yourself | Synonyms: behavior, conduct, doings |
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| (noun) (psychology) the aggregate of the responses or reactions or movements made by an organism in any situation | Synonyms: behavior |
| (noun) (behavioral attributes) the way a person behaves toward other people | Synonyms: behavior, conduct, demeanor, demeanour, deportment |
| (noun) the action or reaction of something (as a machine or substance) under specified circumstances | Synonyms: behavior |
| behavioural | (adjective) of or relating to behavior | Synonyms: behavioral |
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| behaviourism | (noun) an approach to psychology that emphasizes observable measurable behavior | Synonyms: behaviorism, behavioristic psychology, behaviouristic psychology |
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| behaviourist | (adjective) of or relating to behaviorism | Synonyms: behaviorist, behavioristic, behaviouristic |
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| (noun) a psychologist who subscribes to behaviorism | Synonyms: behaviorist |
| behaviouristic | (adjective) of or relating to behaviorism | Synonyms: behaviorist, behavioristic, behaviourist |
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| belabour | (verb) attack verbally with harsh criticism | Synonyms: belabor |
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| (verb) beat soundly | Synonyms: belabor |
| (verb) to work at or to absurd length | Synonyms: belabor |
| benzofuran | (noun) a colorless oily compound extracted from coal tar and used in manufacturing synthetic resins | Synonyms: coumarone, cumarone |
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| biaural | (adjective) relating to or having or hearing with two ears | Synonyms: binaural |
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| biauricular | (adjective) relating to the two auditory openings | - |
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| bicolour | (adjective) having two colors | Synonyms: bichrome, bicolor, bicolored, bicoloured, dichromatic |
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| bicoloured | (adjective) having two colors | Synonyms: bichrome, bicolor, bicolored, bicolour, dichromatic |
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| bifurcate | (adjective) resembling a fork; divided or separated into two branches | Synonyms: biramous, branched, forficate, fork-like, forked, pronged, prongy |
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| (verb) divide into two branches | - |
| (verb) split or divide into two | - |
| bifurcated | (adjective) divided into or made up of two parts | - |
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| bifurcation | (noun) the act of splitting into two branches | - |
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| (noun) the place where something divides into two branches | - |
| (noun) a bifurcating branch (one or both of them) | - |
| binaural | (adjective) relating to or having or hearing with two ears | Synonyms: biaural |
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| binaurally | (adverb) in a binaural manner | Synonyms: in both ears, to both ears |
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| binturong | (noun) arboreal civet of Asia having a long prehensile tail and shaggy black hair | Synonyms: Arctictis bintourong, bearcat |
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| bloodcurdling | (adjective) extremely alarming | Synonyms: hair-raising, nightmarish |
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| blur | (noun) a hazy or indistinct representation | Synonyms: fuzz |
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| (verb) become vague or indistinct | Synonyms: dim, slur |
| (verb) make dim or indistinct | Synonyms: blear |
| (verb) make unclear, indistinct, or blurred | Synonyms: confuse, obnubilate, obscure |
| (verb) make a smudge on; soil by smudging | Synonyms: smear, smudge, smutch |
| (verb) to make less distinct or clear | - |
| (verb) become glassy; lose clear vision | Synonyms: film over, glaze over |
| blurb | (noun) a promotional statement (as found on the dust jackets of books) | Synonyms: endorsement, indorsement |
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| blurred | (adjective) indistinct or hazy in outline | Synonyms: bleary, blurry, foggy, fuzzy, hazy, muzzy |
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| (adjective) unclear in form or expression | Synonyms: clouded |
| blurriness | (noun) the quality of being indistinct and without sharp outlines | Synonyms: fogginess, fuzziness, indistinctness, softness |
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| blurry | (adjective) indistinct or hazy in outline | Synonyms: bleary, blurred, foggy, fuzzy, hazy, muzzy |
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| blurt | (verb) utter impulsively | Synonyms: blunder, blunder out, blurt out, ejaculate |
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| bonheur | (noun) (French) happiness and good humor | - |
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| bourbon | (noun) whiskey distilled from a mash of corn and malt and rye and aged in charred oak barrels | - |
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| bourdon | (noun) a pipe of the bagpipe that is tuned to produce a single continuous tone | Synonyms: drone, drone pipe |
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| bourgeois | (adjective) (according to Marxist thought) being of the property-owning class and exploitive of the working class | - |
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| (adjective) belonging to the middle class | - |
| (adjective) conforming to the standards and conventions of the middle class | Synonyms: conservative, materialistic |
| (noun) a member of the middle class | Synonyms: burgher |
| (noun) a capitalist who engages in industrial commercial enterprise | Synonyms: businessperson |
| bourgeoisie | (noun) the social class between the lower and upper classes | Synonyms: middle class |
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| bourgeon | (verb) produce buds, branches, or germinate | Synonyms: burgeon forth, germinate, pullulate, shoot, sprout, spud |
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| bourguignon | (noun) reduced red wine with onions and parsley and thyme and butter | Synonyms: bourguignon sauce, Burgundy sauce |
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| bourn | (noun) an archaic term for a goal or destination | Synonyms: bourne |
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| (noun) an archaic term for a boundary | Synonyms: bourne |
| bourne | (noun) an archaic term for a goal or destination | Synonyms: bourn |
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| (noun) an archaic term for a boundary | Synonyms: bourn |
| bourtree | (noun) a common shrub with black fruit or a small tree of Europe and Asia; fruit used for wines and jellies | Synonyms: black elder, common elder, elderberry, European elder, Sambucus nigra |
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| brachyuran | (noun) typical crabs | - |
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| brachyurous | (adjective) of or belonging to the suborder Brachyura | - |
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