| 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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| 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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| 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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| 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) | - |
| 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 |
| 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 | (noun) an instance of boastful talk | Synonyms: brag, bragging, crow, gasconade, line-shooting, vaporing |
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| 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 | - |
| crownbeard | (noun) any plant of the genus Verbesina having clustered white or yellow flower heads | Synonyms: crown-beard, crown beard |
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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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| encroacher | (noun) someone who enters by force in order to conquer | Synonyms: invader |
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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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| 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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| macro | (noun) a single computer instruction that results in a series of instructions in machine language | Synonyms: macro instruction |
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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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| 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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| 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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| 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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| 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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| macrosporangium | (noun) a plant structure that produces megaspores | Synonyms: megasporangium |
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| macrospore | (noun) larger of the two types of spore produced in heterosporous plants; develops in ovule into a female gametophyte | Synonyms: megaspore |
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| macrotus | (noun) large-eared greyish bat of southern California and northwestern Mexico | Synonyms: Macrotus californicus |
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| macrozamia | (noun) any treelike cycad of the genus Macrozamia having erect trunks and pinnate leaves and large cones with sometimes edible nuts; Australia | - |
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| microbalance | (noun) balance for weighing very small objects | - |
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| microbar | (noun) the absolute unit of pressure equal to one dyne per square centimeter | Synonyms: bar absolute, barye |
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| microbat | (noun) typically having large ears and feeding primarily on insects; worldwide in distribution | Synonyms: carnivorous bat |
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| microbe | (noun) a minute life form (especially a disease-causing bacterium); the term is not in technical use | Synonyms: bug, germ |
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| microbenthos | (noun) microscopic benthic organisms that are less than 0.1 mm in size. | - |
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| microbiologist | (noun) a specialist in microbiology | - |
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| microbiology | (noun) the branch of biology that studies microorganisms and their effects on humans | - |
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| microblog | (noun) a blog in which there is a limitation on the length of individual postings. | - |
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| microbrachia | (noun) abnormally small arms | - |
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| microbrewery | (noun) a small brewery; consumption of the product is mainly elsewhere | - |
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| microcephalus | (noun) an abnormally small head and underdeveloped brain | Synonyms: microcephaly, nanocephaly |
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| microcephaly | (noun) an abnormally small head and underdeveloped brain | Synonyms: microcephalus, nanocephaly |
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| microchip | (noun) electronic equipment consisting of a small crystal of a silicon semiconductor fabricated to carry out a number of electronic functions in an integrated circuit | Synonyms: chip, micro chip, microprocessor chip, silicon chip |
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| microcircuit | (noun) a microelectronic computer circuit incorporated into a chip or semiconductor; a whole system rather than a single component | Synonyms: integrated circuit |
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| microcode | (noun) (computer science) coded instructions that are stored permanently in read-only memory | Synonyms: firmware |
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| microcomputer | (noun) a small digital computer based on a microprocessor and designed to be used by one person at a time | Synonyms: PC, personal computer |
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| microcosm | (noun) a miniature model of something | - |
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| microcrystal | (noun) any crystal of microscopic size. | - |
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| microcyte | (noun) an abnormally small red blood cell (less than 5 microns in diameter) | - |
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| microcytosis | (noun) a blood disorder characterized by the presence of microcytes (abnormally small red blood cells) in the blood; often associated with anemia | - |
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| microdevice | (noun) any very small device manufactured using microfabrication. | - |
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| microdot | (noun) photograph reduced to the size of a dot (usually for purposes of security) | - |
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| microeconomics | (noun) the branch of economics that studies the economy of consumers or households or individual firms | - |
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| microeconomist | (noun) an economist who specializes in microeconomics | Synonyms: microeconomic expert |
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| microelectronics | (noun) the branch of electronics that deals with miniature components | - |
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| microevolution | (noun) evolution resulting from small specific genetic changes that can lead to a new subspecies | - |
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| microfarad | (noun) a unit of capacitance equal to one millionth of a farad | - |
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| microfiche | (noun) small sheet of microfilm on which many pages of material have been photographed; a magnification system is used to read the material | - |
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| microfilm | (noun) film on which materials are photographed at greatly reduced size; useful for storage; a magnification system is used to read the material | - |
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| microflora | (noun) microscopic plants; bacteria are often considered to be microflora | - |
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| microfossil | (noun) a fossil that must be studied microscopically | - |
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| microgametophyte | (noun) the male gametophyte produced by a microspore | - |
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| microgauss | (noun) a unit of magnetic flux density equal to one millionth of a gauss | - |
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| microglia | (noun) neuroglial tissue of mesodermal origin that can become phagocytic | - |
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| microgliacyte | (noun) a cell of the microglia that may become phagocytic and collect waste products of nerve tissue | - |
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| microgram | (noun) one millionth (1/1,000,000) gram | Synonyms: mcg |
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| micrograph | (noun) a graphic reproduction (as a photograph) of the image of an object formed by a microscope. | - |
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| micrometeor | (noun) a meteorite or meteoroid so small that it drifts down to earth without becoming intensely heated in the atmosphere | Synonyms: micrometeorite, micrometeoroid |
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| micrometeorite | (noun) a meteorite or meteoroid so small that it drifts down to earth without becoming intensely heated in the atmosphere | Synonyms: micrometeor, micrometeoroid |
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| micrometeoroid | (noun) a meteorite or meteoroid so small that it drifts down to earth without becoming intensely heated in the atmosphere | Synonyms: micrometeor, micrometeorite |
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| micrometer | (noun) a metric unit of length equal to one millionth of a meter | Synonyms: micrometre, micron |
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| (noun) caliper for measuring small distances | Synonyms: micrometer caliper, micrometer gauge |
| micrometre | (noun) a metric unit of length equal to one millionth of a meter | Synonyms: micrometer, micron |
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| micrometry | (noun) measuring with a micrometer | - |
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| micromicron | (noun) a metric unit of length equal to one trillionth of a meter | Synonyms: picometer, picometre |
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| micromillimeter | (noun) a metric unit of length equal to one billionth of a meter | Synonyms: micromillimetre, millimicron, nanometer, nanometre, nm |
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| micromillimetre | (noun) a metric unit of length equal to one billionth of a meter | Synonyms: micromillimeter, millimicron, nanometer, nanometre, nm |
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| micron | (noun) a metric unit of length equal to one millionth of a meter | Synonyms: micrometer, micrometre |
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| micronutrient | (noun) a substance needed only in small amounts for normal body function (e.g., vitamins or minerals) | - |
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