| crossbreed | (noun) (genetics) an organism that is the offspring of genetically dissimilar parents or stock; especially offspring produced by breeding plants or animals of different varieties or breeds or species | Synonyms: cross, hybrid |
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| (verb) breed animals or plants using parents of different races and varieties | Synonyms: cross, hybridise, hybridize, interbreed |
| crossbreeding | (noun) (genetics) the act of mixing different species or varieties of animals or plants and thus to produce hybrids | Synonyms: cross, crossing, hybridisation, hybridization, hybridizing, interbreeding |
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| (noun) reproduction by parents of different races (especially by white and non-white persons) | Synonyms: interbreeding, miscegenation |
| crosscheck | (noun) an illegal check (chopping at an opponent's arms or stick) | - |
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| (noun) an instance of confirming something by considering information from several sources | - |
| crosscurrent | (noun) actions counter to the main group activity | Synonyms: countercurrent |
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| (noun) a stretch of turbulent water in a river or the sea caused by one current flowing into or across another current | Synonyms: countercurrent, rip, riptide, tide rip |
| crosscut | (noun) a route shorter than the usual one | Synonyms: cutoff, shortcut |
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| (noun) a diagonal path | - |
| (verb) cut using a diagonal line | Synonyms: cut across |
| crosse | (noun) a long racket with a triangular frame; used in playing lacrosse | - |
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| crossed | (adjective) placed crosswise | - |
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| (adjective) (of a check) marked for deposit only as indicated by having two lines drawn across it | - |
| crossfire | (noun) fire from two or more points so that the lines of fire cross | - |
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| (noun) a lively or heated interchange of ideas and opinions | - |
| crosshairs | (noun) a center of interest | - |
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| crosshatch | (noun) shading consisting of multiple crossing lines | Synonyms: hachure, hatch, hatching |
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| (verb) shade with multiple crossing lines | - |
| crosshatched | (adjective) shaded by means of fine parallel or crossed lines | Synonyms: hatched |
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| crosshead | (noun) metal block that connects to a piston; it slides on parallel guides and moves a connecting rod back and forth | - |
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| (noun) a heading of a subsection printed within the body of the text | Synonyms: crossheading |
| crossheading | (noun) a heading of a subsection printed within the body of the text | Synonyms: crosshead |
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| crossing | (noun) a voyage across a body of water (usually across the Atlantic Ocean) | - |
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| (noun) traveling across | - |
| (noun) (genetics) the act of mixing different species or varieties of animals or plants and thus to produce hybrids | Synonyms: cross, crossbreeding, hybridisation, hybridization, hybridizing, interbreeding |
| (noun) a path (often marked) where something (as a street or railroad) can be crossed to get from one side to the other | Synonyms: crossover, crosswalk |
| (noun) a junction where one street or road crosses another | Synonyms: carrefour, crossroad, crossway, intersection |
| (noun) a point where two lines (paths or arcs etc.) intersect | - |
| (noun) a shallow area in a stream that can be forded | Synonyms: ford |
| crossjack | (noun) the lowermost sail on a mizzenmast | Synonyms: mizzen course |
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| crossly | (adverb) in an ill-natured manner | Synonyms: grouchily, grumpily |
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| crossness | (noun) a disposition to be ill-tempered | Synonyms: crabbedness, crabbiness |
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| (noun) an irritable petulant feeling | Synonyms: choler, fretfulness, fussiness, irritability, peevishness, petulance |
| crossopterygian | (noun) any fish of the order Crossopterygii; most known only in fossil form | Synonyms: lobe-finned fish, lobefin |
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| crossover | (noun) a path (often marked) where something (as a street or railroad) can be crossed to get from one side to the other | Synonyms: crossing, crosswalk |
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| (noun) the appropriation of a new style (especially in popular music) by combining elements of different genres in order to appeal to a wider audience | - |
| (noun) a voter who is registered as a member of one political party but who votes in the primary of another party | Synonyms: crossover voter |
| (noun) the interchange of sections between pairing homologous chromosomes during the prophase of meiosis | Synonyms: crossing over |
| crosspatch | (noun) a bad-tempered person | Synonyms: churl, crank, grouch, grump |
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| crosspiece | (noun) a transverse brace | - |
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| (noun) a horizontal beam that extends across something | Synonyms: crossbeam, trave, traverse |
| crossroad | (noun) a junction where one street or road crosses another | Synonyms: carrefour, crossing, crossway, intersection |
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| crossroads | (noun) a point where a choice must be made | - |
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| (noun) a community of people smaller than a village | Synonyms: hamlet |
| (noun) a crisis situation or point in time when a critical decision must be made | Synonyms: critical point, juncture |
| crossruff | (verb) trump alternately in two hands | - |
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| crosstalk | (noun) the presence of an unwanted signal via an accidental coupling | Synonyms: XT |
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| crosstie | (noun) one of the cross braces that support the rails on a railway track | Synonyms: railroad tie, sleeper, tie |
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| crosstown | (adjective) going or extending across a town or city | Synonyms: cross-town |
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| (adverb) across a town or city | - |
| crosswalk | (noun) a path (often marked) where something (as a street or railroad) can be crossed to get from one side to the other | Synonyms: crossing, crossover |
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| crossway | (noun) a junction where one street or road crosses another | Synonyms: carrefour, crossing, crossroad, intersection |
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| crossways | (adverb) transversely | Synonyms: across, crosswise |
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| crosswind | (noun) wind blowing across the path of a ship or aircraft | - |
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| crosswise | (adjective) lying or extending across the length of a thing or in a cross direction | - |
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| (adjective) in the shape of (a horizontal piece on) a cross | - |
| (adverb) transversely | Synonyms: across, crossways |
| (adverb) not in the intended manner | - |
| crossword | (noun) a puzzle in which words corresponding to numbered clues are to be found and written in to squares in the puzzle | Synonyms: crossword puzzle |
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| crotal | (noun) any of several lichens of the genus Parmelia from which reddish brown or purple dyes are made | Synonyms: crottal, crottle |
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| crotalaria | (noun) any of various plants of the genus Crotalaria having inflated pods within which the seeds rattle; used for pasture and green-manure crops | Synonyms: rattlebox |
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| crotaphion | (noun) the tip of the greater wing of the sphenoid bone | - |
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| crotch | (noun) the angle formed by the inner sides of the legs where they join the human trunk | Synonyms: fork |
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| (noun) external sex organ | Synonyms: genital organ, genitalia, genitals, private parts, privates |
| (noun) the region of the angle formed by the junction of two branches | Synonyms: fork |
| crotchet | (noun) a small tool or hooklike implement | - |
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| (noun) a strange attitude or habit | Synonyms: oddity, queerness, quirk, quirkiness |
| (noun) a musical note having the time value of a quarter of a whole note | Synonyms: quarter note |
| (noun) a sharp curve or crook; a shape resembling a hook | Synonyms: hook |
| crotchetiness | (noun) a fussy and eccentric disposition | Synonyms: contrariness, crankiness, grumpiness |
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| crotchety | (adjective) having a difficult and contrary disposition | Synonyms: cantankerous, ornery |
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| croton | (noun) tropical Asiatic shrub; source of croton oil | Synonyms: Croton tiglium |
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| (noun) grown in many varieties for their brightly colored foliage; widely cultivated as a houseplant | Synonyms: Codiaeum variegatum |
| crotonbug | (noun) small light-brown cockroach brought to United States from Europe; a common household pest | Synonyms: Blattella germanica, Croton bug, German cockroach, water bug |
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| crottal | (noun) any of several lichens of the genus Parmelia from which reddish brown or purple dyes are made | Synonyms: crotal, crottle |
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| crottle | (noun) any of several lichens of the genus Parmelia from which reddish brown or purple dyes are made | Synonyms: crotal, crottal |
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| crouch | (noun) the act of bending low with the limbs close to the body | - |
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| (verb) sit on one's heels | Synonyms: hunker, hunker down, scrunch, scrunch up, squat |
| (verb) bend one's back forward from the waist on down | Synonyms: bend, bow, stoop |
| croup | (noun) the part of an animal that corresponds to the human buttocks | Synonyms: croupe, hindquarters, rump |
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| (noun) a disease of infants and young children; harsh coughing and hoarseness and fever and difficult breathing | Synonyms: spasmodic laryngitis |
| croupe | (noun) the part of an animal that corresponds to the human buttocks | Synonyms: croup, hindquarters, rump |
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| croupier | (noun) someone who collects and pays bets at a gaming table | - |
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| croupy | (adjective) resembling or arising from or indicating croup | - |
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| crouton | (noun) a small piece of toasted or fried bread; served in soup or salads | - |
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| crow | (noun) black birds having a raucous call | - |
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| (noun) an instance of boastful talk | Synonyms: brag, bragging, crowing, gasconade, line-shooting, vaporing |
| (noun) the cry of a cock (or an imitation of it) | - |
| (verb) dwell on with satisfaction | Synonyms: gloat, triumph |
| (verb) express pleasure verbally | - |
| (verb) utter shrill sounds | - |
| crowbait | (noun) an emaciated horse likely soon to become carrion and so attractive to crows | Synonyms: crow-bait |
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| crowbar | (noun) a heavy iron lever with one end forged into a wedge | Synonyms: pry, pry bar, wrecking bar |
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| crowberry | (noun) a low evergreen shrub with small purple flowers and black berrylike fruit | - |
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| crowd | (noun) a large number of things or people considered together | - |
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| (noun) an informal body of friends | Synonyms: bunch, crew, gang |
| (verb) to gather together in large numbers | Synonyms: crowd together |
| (verb) cause to herd, drive, or crowd together | Synonyms: herd |
| (verb) approach a certain age or speed | Synonyms: push |
| (verb) fill or occupy to the point of overflowing | - |
| crowded | (adjective) overfilled or compacted or concentrated | - |
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| crowdfunding | (noun) Funding from a large number of small backers | - |
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| crowding | (noun) a situation in which people or things are crowded together | - |
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| crowdsourcing | (noun) Work done by a large group of anonymous users | - |
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| crowfoot | (noun) any of various plants of the genus Ranunculus | Synonyms: butter-flower, buttercup, butterflower, goldcup, kingcup |
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| crowing | (adjective) exhibiting self-importance | Synonyms: big, boastful, braggart, bragging, braggy, cock-a-hoop, self-aggrandising, self-aggrandizing |
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| (noun) an instance of boastful talk | Synonyms: brag, bragging, crow, gasconade, line-shooting, vaporing |
| crown | (noun) the part of a hat (the vertex) that covers the crown of the head | - |
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| (noun) an ornamental jeweled headdress signifying sovereignty | Synonyms: diadem |
| (noun) a wreath or garland worn on the head to signify victory | - |
| (noun) the center of a cambered road | Synonyms: crest |
| (noun) (dentistry) dental appliance consisting of an artificial crown for a broken or decayed tooth | Synonyms: cap, crownwork, jacket, jacket crown |
| (noun) the part of a tooth above the gum that is covered with enamel | - |
| (noun) the top of the head | Synonyms: pate, poll |
| (noun) the award given to the champion | Synonyms: pennant |
| (noun) the top or extreme point of something (usually a mountain or hill) | Synonyms: crest, peak, summit, tip, top |
| (noun) the upper branches and leaves of a tree or other plant | Synonyms: treetop |
| (noun) an English coin worth 5 shillings | - |
| (verb) be the culminating event | Synonyms: top |
| (verb) put an enamel cover on | - |
| (verb) invest with regal power; enthrone | Synonyms: coronate |
| (verb) form the topmost part of | - |
| crownbeard | (noun) any plant of the genus Verbesina having clustered white or yellow flower heads | Synonyms: crown-beard, crown beard |
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| crowned | (adjective) provided with or as if with a crown or a crown as specified; often used in combination | - |
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| (adjective) having an (artificial) crown on a tooth | - |
| (adjective) crowned with or as if with laurel symbolizing victory | Synonyms: laureled, laurelled |
| crowning | (adjective) forming or providing a crown or summit | - |
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| (adjective) representing a level of the highest possible achievement or attainment | - |
| crownless | (adjective) not (especially not yet) provided with a crown | Synonyms: uncrowned |
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| crownwork | (noun) (dentistry) dental appliance consisting of an artificial crown for a broken or decayed tooth | Synonyms: cap, crown, jacket, jacket crown |
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| (noun) a type of fortification, like a hornwork, but consisting of a full bastion with the walls on either side ending in half-bastions from which longer flank walls run back towards the main fortress. | - |
| crozier | (noun) a staff surmounted by a crook or cross carried by bishops as a symbol of pastoral office | Synonyms: crosier |
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| encroach | (verb) advance beyond the usual limit | Synonyms: impinge, infringe |
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| (verb) impinge or infringe upon | Synonyms: entrench, impinge, trench |
| encroacher | (noun) someone who enters by force in order to conquer | Synonyms: invader |
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| encroaching | (adjective) gradually intrusive without right or permission | Synonyms: invasive, trespassing |
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| encroachment | (noun) entry to another's property without right or permission | Synonyms: intrusion, trespass, usurpation, violation |
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| (noun) influencing strongly | Synonyms: impact, impingement |
| (noun) any entry into an area not previously occupied | Synonyms: intrusion, invasion |
| escrow | (noun) a written agreement (or property or money) delivered to a third party or put in trust by one party to a contract to be returned after fulfillment of some condition | - |
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| intercrossed | (adjective) produced by crossbreeding | Synonyms: hybrid |
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| lacrosse | (noun) a game invented by American Indians; now played by two teams who use long-handled rackets to catch and carry and throw the ball toward the opponents' goal | - |
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| lepidocrocite | (noun) a red to reddish brown mineral consisting of iron oxide hydroxide; often found in iron ores together with goethite | - |
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| ludicrous | (adjective) so unreasonable as to invite derision | Synonyms: absurd, cockeyed, derisory, idiotic, laughable, nonsensical, preposterous, ridiculous |
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| (adjective) broadly or extravagantly humorous; resembling farce | Synonyms: farcical, ridiculous |
| ludicrously | (adverb) so as to arouse or deserve laughter | Synonyms: laughably, preposterously, ridiculously |
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| macro | (adjective) very large in scale or scope or capability | - |
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| (noun) a single computer instruction that results in a series of instructions in machine language | Synonyms: macro instruction |
| macrobiotic | (adjective) of or relating to the theory or practice of macrobiotics | - |
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| macrobiotics | (noun) the theory of promoting health and longevity by means of diet (especially whole beans and grains) | - |
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| macrocephalic | (adjective) having an exceptionally large head and brain | Synonyms: macrocephalous |
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| macrocephalous | (adjective) having an exceptionally large head and brain | Synonyms: macrocephalic |
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| macrocephaly | (noun) an abnormally large head; differs from hydrocephalus because there is no increased intracranial pressure and the overgrowth is symmetrical | Synonyms: megacephaly, megalocephaly |
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| macrocosm | (noun) everything that exists anywhere | Synonyms: cosmos, creation, existence, universe, world |
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| macrocosmic | (adjective) relating to or constituting a macrocosm | - |
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| macrocyte | (noun) abnormally large red blood cell (associated with pernicious anemia) | Synonyms: megalocyte |
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| macrocytosis | (noun) the presence of macrocytes in the blood | - |
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| macroeconomic | (adjective) of or relating to macroeconomics | - |
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| macroeconomics | (noun) the branch of economics that studies the overall working of a national economy | - |
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| macroeconomist | (noun) an economist who specializes in macroeconomics | Synonyms: macroeconomic expert |
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| macroelement | (noun) a chemical element required in relatively large quantities for the normal physiologic processes of the body. | Synonyms: major mineral |
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| macroevolution | (noun) evolution on a large scale extending over geologic era and resulting in the formation of new taxonomic groups | - |
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| macroglia | (noun) tissue consisting of large stellate neuroglial cells | Synonyms: astroglia |
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| macroglossia | (noun) a congenital disorder characterized by an abnormally large tongue; often seen in cases of Down's syndrome | - |
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| macromolecular | (adjective) relating to or consisting of or characterized by macromolecules | - |
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| macromolecule | (noun) any very large complex molecule; found only in plants and animals | Synonyms: supermolecule |
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| macron | (noun) a diacritical mark (-) placed above a vowel to indicate a long sound | - |
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| macrophage | (noun) a large phagocyte; some are fixed and other circulate in the blood stream | - |
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| macroscopic | (adjective) large enough to be visible with the naked eye | Synonyms: macroscopical |
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| (adjective) visible to the naked eye; using the naked eye | Synonyms: macroscopical |