| codeine | (noun) derivative of opium; used as an antitussive (to relieve coughing) and an analgesic (to relieve pain) | - |
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| coder | (noun) a person who designs and writes and tests computer programs | Synonyms: computer programmer, programmer, software engineer |
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| codetalker | (noun) a secret agent who was one of the Navajos who devised and used a code based on their native language; the code was unbroken by the Japanese during World War II | Synonyms: windtalker |
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| codex | (noun) an unbound manuscript of some ancient classic (as distinguished from a scroll) | Synonyms: leaf-book |
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| (noun) an official list of chemicals or medicines etc. | - |
| codfish | (noun) major food fish of Arctic and cold-temperate waters | Synonyms: cod |
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| (noun) lean white flesh of important North Atlantic food fish; usually baked or poached | Synonyms: cod |
| codger | (noun) used affectionately to refer to an eccentric but amusing old man | Synonyms: old codger |
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| codicil | (noun) a supplement to a will; a testamentary instrument intended to alter an already executed will | - |
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| codification | (noun) the act of codifying; arranging in a systematic order | - |
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| (noun) a set of rules or principles or laws (especially written ones) | Synonyms: code |
| codified | (adjective) enacted by a legislative body | Synonyms: statute |
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| codify | (verb) organize into a code or system, such as a body of law | - |
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| coding | (noun) act of writing in code or cipher | Synonyms: cryptography, secret writing, steganography |
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| codling | (noun) young codfish | - |
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| codon | (noun) a specific sequence of three adjacent nucleotides on a strand of DNA or RNA that specifies the genetic code information for synthesizing a particular amino acid | - |
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| codpiece | (noun) (15th-16th century) a flap for the crotch of men's tight-fitting breeches | - |
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| codswallop | (noun) nonsensical talk or writing | Synonyms: applesauce, folderol, rubbish, trash, tripe, trumpery, wish-wash |
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| collodion | (noun) a colorless syrupy solution of pyroxylin in ether and alcohol; used as a coating for wounds or photographic films | - |
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| commode | (noun) a plumbing fixture for defecation and urination | Synonyms: can, crapper, pot, potty, stool, throne, toilet |
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| (noun) a tall elegant chest of drawers | Synonyms: chiffonier |
| commodious | (adjective) large and roomy (`convenient' is archaic in this sense) | Synonyms: convenient |
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| commodiousness | (noun) spatial largeness and extensiveness (especially inside a building) | Synonyms: capaciousness, roominess, spaciousness |
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| commodity | (noun) a raw material that is sold in large quantities, usually to other businesses for manufacturing or production purposes | Synonyms: good, trade good |
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| commodore | (noun) a commissioned naval officer who ranks above a captain and below a rear admiral; the lowest grade of admiral | - |
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| conodont | (noun) small (2 inches long) extinct eellike fish with a finned tail and a notochord and having cone-shaped teeth containing cellular bone; late Cambrian to late Triassic; possible predecessor of the cyclostomes | - |
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| (noun) the tiny fossil cone-shaped tooth of a primitive vertebrate of order Conodonta | - |
| copepod | (noun) minute marine or freshwater crustaceans usually having six pairs of limbs on the thorax; some abundant in plankton and others parasitic on fish | Synonyms: copepod crustacean |
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| coralwood | (noun) East Indian tree with racemes of yellow-white flowers; cultivated as an ornamental | Synonyms: Adenanthera pavonina, Barbados pride, coral-wood, peacock flower fence, red sandalwood |
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| cordwood | (noun) firewood cut and stacked in cords; wood sold by the cord | - |
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| corkwood | (noun) very small deciduous dioecious tree or shrub of damp habitats in southeastern United States having extremely light wood | Synonyms: corkwood tree, Leitneria floridana |
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| corrode | (verb) become destroyed by water, air, or a corrosive such as an acid | Synonyms: rust |
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| (verb) cause to deteriorate due to the action of water, air, or an acid | Synonyms: eat, rust |
| corroded | (adjective) eaten away as by acid or oxidation | - |
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| corroding | (noun) erosion by chemical action | Synonyms: corrosion, erosion |
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| cottonwood | (noun) any of several North American trees of the genus Populus having a tuft of cottony hairs on the seed | - |
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| (noun) American basswood of the Allegheny region | Synonyms: Tilia heterophylla, white basswood |
| counterproductive | (adjective) tending to hinder the achievement of a goal | - |
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| crocodile | (noun) large voracious aquatic reptile having a long snout with massive jaws and sharp teeth and a body covered with bony plates; of sluggish tropical waters | - |
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| crocodilian | (noun) extant archosaurian reptile | Synonyms: crocodilian reptile |
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| custodial | (adjective) providing protective supervision; watching over or safeguarding | Synonyms: tutelar, tutelary |
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| custodian | (noun) one having charge of buildings or grounds or animals | Synonyms: keeper, steward |
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| custodianship | (noun) the position of custodian | - |
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| custody | (noun) holding by the police | - |
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| (noun) (with `in') guardianship over; in divorce cases it is the right to house and care for and discipline a child | Synonyms: hands |
| (noun) a state of being confined (usually for a short time) | Synonyms: detainment, detention, hold |
| cynodont | (noun) small carnivorous reptiles | - |
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| cyprinodont | (noun) any member of the family Cyprinodontidae | - |
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| daffodil | (noun) any of numerous varieties of Narcissus plants having showy often yellow flowers with a trumpet-shaped central crown | Synonyms: Narcissus pseudonarcissus |
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| deadwood | (noun) someone or something that is unwanted and unneeded | Synonyms: fifth wheel |
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| (noun) a branch or a part of a tree that is dead | - |
| decapod | (noun) crustaceans characteristically having five pairs of locomotor appendages each joined to a segment of the thorax | Synonyms: decapod crustacean |
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| (noun) cephalopods having eight short tentacles plus two long ones | - |
| decode | (verb) convert code into ordinary language | Synonyms: decipher, decrypt |
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| decoder | (noun) a machine that converts a coded text into ordinary language | - |
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| (noun) the kind of intellectual who converts messages from a code to plain text | Synonyms: decipherer |
| decoding | (noun) the activity of making clear or converting from code into plain text | Synonyms: decipherment, decryption |
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| demigod | (noun) a person who is part mortal and part god | Synonyms: daemon |
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| (noun) a person with great powers and abilities | Synonyms: superman, Ubermensch |
| demode | (adjective) out of fashion | Synonyms: antique, ex, old-fashioned, old-hat, outmoded, passe, passee |
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| demodulate | (verb) extract information from a modulated carrier wave | - |
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| demodulation | (noun) (electronics) the reception of a signal by extracting it from the carrier wave | - |
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| demodulator | (noun) rectifier that extracts modulation from a radio carrier wave | Synonyms: detector |
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| deodar | (noun) tall East Indian cedar having spreading branches with nodding tips; highly valued for its appearance as well as its timber | Synonyms: Cedrus deodara, deodar cedar, Himalayan cedar |
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| deodorant | (noun) a toiletry applied to the skin in order to mask unpleasant odors | Synonyms: deodourant |
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| deodorise | (verb) eliminate the odor from | Synonyms: deodorize, deodourise |
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| deodorize | (verb) eliminate the odor from | Synonyms: deodorise, deodourise |
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| deodourant | (noun) a toiletry applied to the skin in order to mask unpleasant odors | Synonyms: deodorant |
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| deodourise | (verb) eliminate the odor from | Synonyms: deodorise, deodorize |
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| devilwood | (noun) small tree of southern United States having panicles of dull white flowers followed by dark purple fruits | Synonyms: American olive, Osmanthus americanus |
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| dicamptodon | (noun) salamanders found near cold streams throughout the year | Synonyms: dicamptodontid |
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| dicamptodontid | (noun) salamanders found near cold streams throughout the year | Synonyms: dicamptodon |
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| dichlorodiphenyltrichloroethane | (noun) an insecticide that is also toxic to animals and humans; banned in the United States since 1972 | Synonyms: DDT |
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| dicynodont | (noun) a kind of therapsid | - |
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| dimetrodon | (noun) carnivorous dinosaur of the Permian in North America having a crest or dorsal sail | - |
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| diode | (noun) a semiconductor that consists of a p-n junction | Synonyms: crystal rectifier, junction rectifier, semiconductor diode |
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| (noun) a thermionic tube having two electrodes; used as a rectifier | Synonyms: rectifying tube, rectifying valve |
| diplodocus | (noun) a huge quadrupedal herbivore with long neck and tail; of late Jurassic in western North America | - |
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| discommode | (verb) to cause inconvenience or discomfort to | Synonyms: bother, disoblige, incommode, inconvenience, put out, trouble |
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| disembodied | (adjective) not having a material body | Synonyms: bodiless, discorporate, unbodied, unembodied |
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| disembody | (verb) free from a body or physical form or reality | - |
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| dislodge | (verb) remove or force out from a position | Synonyms: free |
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| (verb) remove or force from a position of dwelling previously occupied | Synonyms: bump |
| (verb) change place or direction | Synonyms: reposition, shift |
| dislodgement | (noun) forced removal from a position of advantage | Synonyms: dislodgment |
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| dislodgment | (noun) forced removal from a position of advantage | Synonyms: dislodgement |
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| dodder | (noun) a leafless annual parasitic vine of the genus Cuscuta having whitish or yellow filamentous stems; obtain nourishment through haustoria | - |
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| (verb) walk unsteadily, with short steps | Synonyms: coggle, paddle, toddle, totter, waddle |
| dodderer | (noun) one who dodders from old age and weakness | - |
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| doddering | (adjective) mentally or physically infirm with age | Synonyms: doddery, gaga, senile |
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| doddery | (adjective) mentally or physically infirm with age | Synonyms: doddering, gaga, senile |
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| doddle | (noun) an easy task | - |
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| dodecagon | (noun) a twelve-sided polygon | - |
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| dodecahedron | (noun) any polyhedron having twelve plane faces | - |
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| dodge | (noun) a quick evasive movement | - |
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| (noun) an elaborate or deceitful scheme contrived to deceive or evade | Synonyms: contrivance, stratagem |
| (noun) a statement that evades the question by cleverness or trickery | Synonyms: dodging, scheme |
| (verb) avoid or try to avoid fulfilling, answering, or performing (duties, questions, or issues) | Synonyms: circumvent, duck, elude, evade, fudge, hedge, parry, put off, sidestep, skirt |
| (verb) make a sudden movement in a new direction so as to avoid | - |
| (verb) move to and fro or from place to place usually in an irregular course | - |
| dodger | (noun) small oval cake of corn bread baked or fried (chiefly southern) | Synonyms: corn dab, corn dodger |
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| (noun) a shifty deceptive person | Synonyms: fox, slyboots |
| dodging | (noun) nonperformance of something distasteful (as by deceit or trickery) that you are supposed to do | Synonyms: escape, evasion |
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| (noun) deliberately avoiding; keeping away from or preventing from happening | Synonyms: avoidance, shunning, turning away |
| (noun) a statement that evades the question by cleverness or trickery | Synonyms: dodge, scheme |
| dodgy | (adjective) marked by skill in deception | Synonyms: crafty, cunning, foxy, guileful, knavish, slick, sly, tricksy, tricky, wily |
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| (adjective) of uncertain outcome; especially fraught with risk | Synonyms: chanceful, chancy, dicey |
| dodo | (noun) extinct heavy flightless bird of Mauritius related to pigeons | Synonyms: Raphus cucullatus |
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| (noun) someone whose style is out of fashion | Synonyms: fogey, fogy, fossil |
| dogsbody | (noun) a worker who has to do all the unpleasant or boring jobs that no one else wants to do | - |
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| dogwood | (noun) a tree of shrub of the genus Cornus often having showy bracts resembling flowers | Synonyms: cornel, dogwood tree |
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| (noun) hard tough wood of any dogwood of the genus Cornus; resembles boxwood | - |
| doodad | (noun) something unspecified whose name is either forgotten or not known | Synonyms: dojigger, doohickey, gimmick, gismo, gizmo, gubbins, thingamabob, thingamajig, thingmabob, thingmajig, thingumabob, thingumajig, thingummy, whatchamacallit, whatchamacallum, whatsis, widget |
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| doodia | (noun) any fern of the genus Doodia having pinnate fronds with sharply dentate pinnae | Synonyms: rasp fern |
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| doodle | (noun) an aimless drawing | Synonyms: scrabble, scribble |
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| (verb) make a doodle; draw aimlessly | - |
| doodlebug | (noun) the larva of any of several insects | Synonyms: ant lion, antlion |
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| (noun) a small jet-propelled winged missile that carries a bomb | Synonyms: buzz bomb, flying bomb, robot bomb, V-1 |
| (noun) a small motor vehicle | - |
| downtrodden | (adjective) abused or oppressed by people in power | - |
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| driftwood | (noun) wood that is floating or that has been washed ashore | - |
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| drygoods | (noun) textiles or clothing and related merchandise | Synonyms: soft goods |
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| duodecimal | (adjective) based on twelve | - |
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| (noun) one part in twelve equal parts | Synonyms: one-twelfth, twelfth, twelfth part |
| duodenal | (adjective) in or relating to the duodenum | - |
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| duodenum | (noun) the part of the small intestine between the stomach and the jejunum | - |
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| duodiode | (noun) an electron tube having two diodes in the same envelope, with either a common cathode or separate cathodes. | - |
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| dyewood | (noun) any wood from which dye is obtained | - |
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| echinoderm | (noun) marine invertebrates with tube feet and five-part radially symmetrical bodies | - |
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| ectoderm | (noun) the outer germ layer that develops into skin and nervous tissue | Synonyms: ectoblast, exoderm |
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| ectodermal | (adjective) of or relating to the ectoderm | Synonyms: ectodermic |
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| ectodermic | (adjective) of or relating to the ectoderm | Synonyms: ectodermal |
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