| clandestine | (adjective) conducted with or marked by hidden aims or methods | Synonyms: cloak-and-dagger, hole-and-corner, hugger-mugger, hush-hush, secret, surreptitious, undercover, underground |
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| clarinetist | (noun) a musician who plays the clarinet | Synonyms: clarinettist |
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| clarinettist | (noun) a musician who plays the clarinet | Synonyms: clarinetist |
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| classicist | (noun) an artistic person who adheres to classicism | - |
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| (noun) a student of ancient Greek and Latin | Synonyms: classical scholar |
| classicistic | (adjective) of or relating to classicism | - |
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| clast | (noun) (geology) a constituent fragment of a clastic rock | - |
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| clastic | (adjective) capable of being taken apart | - |
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| (adjective) of or belonging to or being a rock composed of fragments of older rocks (e.g., conglomerates or sandstone) | - |
| claustrophobe | (noun) a person suffering from claustrophobia | - |
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| claustrophobia | (noun) a morbid fear of being closed in a confined space | - |
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| claustrophobic | (adjective) suffering from claustrophobia; abnormally afraid of closed-in places | - |
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| (adjective) uncomfortably closed or hemmed in | - |
| claustrum | (noun) a layer of grey matter in the brain adjacent to the lenticular nucleus | - |
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| claystone | (noun) fine-grained rock consisting of compacted clay particles | - |
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| clearstory | (noun) part of an interior wall rising above the adjacent roof with windows admitting light | Synonyms: clerestory |
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| cleistocarp | (noun) closed spore-bearing structure of some fungi (especially Aspergillaceae and Erysiphaceae) from which spores are released only by decay or disintegration | Synonyms: cleistothecium |
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| cleistogamic | (adjective) exhibiting or relating to cleistogamy | Synonyms: cleistogamous |
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| cleistogamous | (adjective) exhibiting or relating to cleistogamy | Synonyms: cleistogamic |
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| cleistogamy | (noun) the production of small nonopening self-pollinating flowers | - |
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| cleistothecium | (noun) closed spore-bearing structure of some fungi (especially Aspergillaceae and Erysiphaceae) from which spores are released only by decay or disintegration | Synonyms: cleistocarp |
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| clerestory | (noun) part of an interior wall rising above the adjacent roof with windows admitting light | Synonyms: clearstory |
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| clericalist | (noun) one who advocates clericalism | - |
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| climatologist | (noun) someone who is expert in climatology | - |
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| clingstone | (noun) fruit (especially peach) whose flesh adheres strongly to the pit | Synonyms: cling |
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| cloister | (noun) residence that is a place of religious seclusion (such as a monastery) | Synonyms: religious residence |
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| (noun) a courtyard with covered walks (as in religious institutions) | - |
| (verb) seclude from the world in or as if in a cloister | - |
| (verb) surround with a cloister | - |
| (verb) surround with a cloister, as of a garden | - |
| cloistered | (adjective) providing privacy or seclusion | Synonyms: reclusive, secluded, sequestered |
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| (adjective) of communal life sequestered from the world under religious vows | Synonyms: cloistral, conventual, monastic, monastical |
| cloistral | (adjective) of communal life sequestered from the world under religious vows | Synonyms: cloistered, conventual, monastic, monastical |
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| closefisted | (adjective) unwilling to part with money | Synonyms: hardfisted, tightfisted |
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| closest | (adverb) (superlative of `near' or `close') within the shortest distance | Synonyms: nearest, nighest |
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| clostridia | (noun) spindle-shaped bacterial cell especially one swollen at the center by an endospore | Synonyms: clostridium |
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| clostridium | (noun) spindle-shaped bacterial cell especially one swollen at the center by an endospore | Synonyms: clostridia |
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| cloudburst | (noun) a heavy rain | Synonyms: deluge, downpour, pelter, soaker, torrent, waterspout |
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| cluster | (noun) a grouping of a number of similar things | Synonyms: bunch, clump, clustering |
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| (verb) gather or cause to gather into a cluster | Synonyms: bunch, bundle, clump |
| (verb) come together as in a cluster or flock | Synonyms: clump, constellate, flock |
| clustered | (adjective) clustered together but not coherent | Synonyms: agglomerate, agglomerated, agglomerative |
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| (adjective) growing close together but not in dense mats | - |
| clusterfuck | (noun) A chaotic situation where everything seems to go wrong | - |
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| clustering | (noun) a grouping of a number of similar things | Synonyms: bunch, clump, cluster |
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| clyster | (noun) an injection of a liquid through the anus to stimulate evacuation; sometimes used for diagnostic purposes | Synonyms: enema |
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| coast | (noun) the act of moving smoothly along a surface while remaining in contact with it | Synonyms: glide, slide |
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| (noun) the area within view | - |
| (noun) the shore of a sea or ocean | Synonyms: sea-coast, seacoast, seashore |
| (noun) a slope down which sleds may coast | - |
| (verb) move effortlessly; by force of gravity | - |
| coastal | (adjective) located on or near or bordering on a coast | - |
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| (adjective) of or relating to a coast | - |
| (adjective) along or following a coast | Synonyms: coastwise |
| coaster | (noun) a covering (plate or mat) that protects the surface of a table (i.e., from the condensation on a cold glass or bottle) | - |
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| (noun) someone who coasts | - |
| (noun) a resident of a coastal area | - |
| coastguard | (noun) a military service responsible for the safety of maritime traffic in coastal waters | - |
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| coastguardsman | (noun) a member of a coastguard | - |
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| coastland | (noun) land in a coastal area | - |
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| coastline | (noun) the outline of a coast | - |
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| coastward | (adverb) in the direction of the coast | - |
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| coastwise | (adjective) along or following a coast | Synonyms: coastal |
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| (adverb) by way of, or along the coast | - |
| cobblestone | (noun) rectangular paving stone with curved top; once used to make roads | Synonyms: cobble, sett |
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| (verb) pave with cobblestones | Synonyms: cobble |
| coelostat | (noun) optical device used to follow the path of a celestial body and reflect its light into a telescope; has a movable and a fixed mirror | - |
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| coexist | (verb) exist together | Synonyms: cohabit |
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| (verb) coexist peacefully, as of nations | - |
| coexistence | (noun) existing peacefully together | - |
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| coexistent | (adjective) existing at the same time | Synonyms: coexisting |
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| coexisting | (adjective) existing at the same time | Synonyms: coexistent |
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| collaborationist | (noun) someone who collaborates with an enemy occupying force | Synonyms: collaborator, quisling |
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| collectivist | (adjective) subscribing to the socialistic doctrine of ownership by the people collectively | Synonyms: collectivised, collectivistic, collectivized, state-controlled |
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| (noun) a person who belongs to the political left | Synonyms: left-winger, leftist |
| collectivistic | (adjective) subscribing to the socialistic doctrine of ownership by the people collectively | Synonyms: collectivised, collectivist, collectivized, state-controlled |
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| colonialist | (noun) a believer in colonialism | - |
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| colonist | (noun) a person who settles in a new colony or moves into new country | Synonyms: settler |
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| colorcast | (noun) a television program that is broadcast in color | Synonyms: colourcast |
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| (verb) broadcast in color | - |
| colorfast | (adjective) having color that is resistant to fading or running | - |
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| colorist | (noun) a painter able to achieve special effects with color | - |
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| colostomy | (noun) a surgical operation that creates an opening from the colon to the surface of the body to function as an anus | - |
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| colostrum | (noun) milky fluid secreted for the first day or two after parturition | Synonyms: foremilk |
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| colourcast | (noun) a television program that is broadcast in color | Synonyms: colorcast |
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| colpocystitis | (noun) inflammation of the vagina and bladder | - |
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| colpocystocele | (noun) hernia in which the urinary bladder protrudes through the wall of the vagina; sometimes occurs after childbirth | Synonyms: cystocele |
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| columnist | (noun) a journalist who writes editorials | Synonyms: editorialist |
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| combust | (verb) undergo combustion | Synonyms: burn |
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| (verb) get very angry and fly into a rage | Synonyms: blow a fuse, blow one's stack, blow up, flip one's lid, flip one's wig, fly off the handle, go ballistic, have a fit, have kittens, hit the ceiling, hit the roof, lose one's temper, throw a fit |
| (verb) cause to become violent or angry | - |
| (verb) start to burn or burst into flames | Synonyms: catch fire, conflagrate, erupt, ignite, take fire |
| (verb) cause to burn or combust | Synonyms: burn |
| combustibility | (noun) the quality of being capable of igniting and burning | Synonyms: burnability, combustibleness |
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| combustible | (adjective) capable of igniting and burning | - |
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| (noun) a substance that can be burned to provide heat or power | Synonyms: combustible material |
| combustibleness | (noun) the quality of being capable of igniting and burning | Synonyms: burnability, combustibility |
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| combustion | (noun) the act of burning something | Synonyms: burning |
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| (noun) a process in which a substance reacts with oxygen to give heat and light | Synonyms: burning |
| (noun) a state of violent disturbance and excitement | - |
| combustive | (adjective) supporting combustion | Synonyms: comburant, comburent |
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| comestible | (adjective) suitable for use as food | Synonyms: eatable, edible |
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| (noun) any substance that can be used as food | Synonyms: eatable, edible, pabulum, victual, victuals |
| communist | (adjective) relating to or marked by communism | Synonyms: communistic |
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| (noun) a socialist who advocates communism | Synonyms: commie |
| communistic | (adjective) relating to or marked by communism | Synonyms: communist |
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| compost | (noun) a mixture of decaying vegetation and manure; used as a fertilizer | - |
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| (verb) convert to compost | - |
| conacaste | (noun) tropical South American tree having a wide-spreading crown of bipinnate leaves and coiled ear-shaped fruits; grown for shade and ornament as well as valuable timber | Synonyms: elephant's ear, Enterolobium cyclocarpa |
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| conceptualistic | (adjective) involving or characteristic of conceptualism | - |
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| concertinist | (noun) a person who plays the concertina | - |
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| conchologist | (noun) a collector and student of mollusc shells | - |
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| concretistic | (adjective) of or relating to concrete representations of abstractions | - |
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| conformist | (adjective) marked by convention and conformity to customs or rules or styles | - |
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| (adjective) adhering to established customs or doctrines (especially in religion) | Synonyms: conforming |
| (noun) someone who conforms to established standards of conduct (especially in religious matters) | - |
| congest | (verb) become or cause to become obstructed | Synonyms: back up, choke, choke off, clog, clog up, crap up, foul |
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| congested | (adjective) overfull as with blood | Synonyms: engorged |
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| congestion | (noun) excessive accumulation of blood or other fluid in a body part | - |
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| (noun) excessive crowding | Synonyms: over-crowding |
| congestive | (adjective) relating to or affected by an abnormal collection of blood or other fluid | - |
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| conquest | (noun) success in mastering something difficult | - |
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| (noun) the act of conquering | Synonyms: conquering, subjection, subjugation |
| (noun) an act of winning the love or sexual favor of someone | Synonyms: seduction |
| conquistador | (noun) an adventurer (especially one who led the Spanish conquest of Mexico and Peru in the 16th century) | - |
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| conservationist | (noun) someone who works to protect the environment from destruction or pollution | Synonyms: environmentalist |
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| conservativist | (noun) a person who is reluctant to accept changes and new ideas | Synonyms: conservative |
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| consist | (verb) originate (in) | Synonyms: dwell, lie, lie in |
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| (verb) be composed of | Synonyms: comprise |
| (verb) be consistent in form, tenor, or character; be congruous | - |
| (verb) have its essential character; be comprised or contained in; be embodied in | - |
| consistence | (noun) the property of holding together and retaining its shape | Synonyms: body, consistency, substance |
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| (noun) a harmonious uniformity or agreement among things or parts | Synonyms: consistency |
| consistency | (noun) the property of holding together and retaining its shape | Synonyms: body, consistence, substance |
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| (noun) (logic) an attribute of a logical system that is so constituted that none of the propositions deducible from the axioms contradict one another | - |
| (noun) a harmonious uniformity or agreement among things or parts | Synonyms: consistence |
| (noun) logical coherence and accordance with the facts | - |
| consistent | (adjective) (sometimes followed by `with') in agreement or consistent or reliable | - |
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| (adjective) marked by an orderly, logical, and aesthetically consistent relation of parts | Synonyms: coherent, logical, ordered |
| (adjective) capable of being reproduced | Synonyms: reproducible |
| (adjective) the same throughout in structure or composition | Synonyms: uniform |
| consistently | (adverb) in a systematic or consistent manner | Synonyms: systematically |
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| consistory | (noun) a church tribunal or governing body | - |
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| constable | (noun) a lawman with less authority and jurisdiction than a sheriff | - |
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| (noun) a police officer of the lowest rank | Synonyms: police constable |
| constabulary | (noun) the force of policemen and officers | Synonyms: law, police, police force |
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| constancy | (noun) the quality of being enduring and free from change or variation | Synonyms: stability |
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| (noun) faithfulness and dependability in personal attachments (especially sexual fidelity) | - |
| (noun) (psychology) the tendency for perceived objects to give rise to very similar perceptual experiences in spite of wide variations in the conditions of observation | Synonyms: perceptual constancy |
| constant | (adjective) steadfast in purpose or devotion or affection | - |
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| (adjective) uninterrupted in time and indefinitely long continuing | Synonyms: ceaseless, incessant, never-ending, perpetual, unceasing, unremitting |
| (adjective) unvarying in nature | Synonyms: changeless, invariant, unvarying |
| (noun) a quantity that does not vary | Synonyms: constant quantity, invariable |
| (noun) a number representing a quantity assumed to have a fixed value in a specified mathematical context | - |
| constantan | (noun) an alloy of copper and nickel with high electrical resistance and a low temperature coefficient; used as resistance wire | Synonyms: Eureka |
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| constantly | (adverb) invariably | Synonyms: always, forever, incessantly, perpetually |
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| (adverb) without variation or change, in every case | Synonyms: always, invariably |