| curvilinear | (adjective) characterized by or following a curved line | Synonyms: curvilineal |
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| cuspidor | (noun) a receptacle for spit (usually in a public place) | Synonyms: spittoon |
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| customer | (noun) someone who pays for goods or services | Synonyms: client |
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| cuticular | (adjective) of or relating to a cuticle or cuticula | Synonyms: dermal, epidermal, epidermic |
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| cutler | (noun) a dealer in cutlery | - |
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| cutter | (noun) a cutting implement; a tool for cutting | Synonyms: cutlery, cutting tool |
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| (noun) a boat for communication between ship and shore | Synonyms: pinnace, ship's boat, tender |
| (noun) a sailing vessel with a single mast set further back than the mast of a sloop | - |
| (noun) someone whose work is cutting (as e.g. cutting cloth for garments) | - |
| (noun) someone who carves the meat | Synonyms: carver |
| (noun) someone who cuts or carves stone | Synonyms: stonecutter |
| cyberwar | (noun) an assault on electronic communication networks | Synonyms: cyber-terrorism |
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| cyder | (noun) a beverage made from juice pressed from apples | Synonyms: cider |
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| cylinder | (noun) a cylindrical container for oxygen or compressed air | - |
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| (noun) a chamber within which piston moves | Synonyms: piston chamber |
| (noun) a surface generated by rotating a parallel line around a fixed line | - |
| (noun) a solid bounded by a cylindrical surface and two parallel planes (the bases) | - |
| cypher | (noun) a secret method of writing | Synonyms: cipher, cryptograph, secret code |
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| (noun) a message written in a secret code | Synonyms: cipher |
| (noun) a person of no influence | Synonyms: cipher, nobody, nonentity |
| (noun) a quantity of no importance; thing (object:), singular, negative pronoun; pronoun, thing, singular; quantifier: negative existential | Synonyms: aught, cipher, goose egg, nada, naught, nil, nix, nothing, null, zero, zilch, zip, zippo |
| (noun) a mathematical element that when added to another number yields the same number | Synonyms: 0, cipher, nought, zero |
| (verb) make a mathematical calculation or computation | Synonyms: calculate, cipher, compute, figure, reckon, work out |
| (verb) convert ordinary language into code | Synonyms: cipher, code, encipher, encrypt, inscribe, write in code |
| cytophotometer | (noun) a photometer that can be used to locate and identify chemical compounds in a cell by measuring the intensity of the light that passes through stained sections of the cytoplasm | - |
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| cytosmear | (noun) a thin tissue or blood sample spread on a glass slide and stained for cytologic examination and diagnosis under a microscope | Synonyms: cytologic smear, smear |
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| czar | (noun) a person having great power | - |
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| (noun) a male monarch or emperor (especially of Russia prior to 1917) | Synonyms: tsar, tzar |
| dabbler | (noun) any of numerous shallow-water ducks that feed by upending and dabbling | Synonyms: dabbling duck |
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| (noun) an amateur who engages in an activity without serious intentions and who pretends to have knowledge | Synonyms: dilettante, sciolist |
| dagger | (noun) a short knife with a pointed blade used for piercing or stabbing | Synonyms: sticker |
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| (noun) a character used in printing to indicate a second cross reference or footnote when the asterisk has already been used | Synonyms: obelisk |
| dallier | (noun) someone who wastes time | Synonyms: dilly-dallier, dillydallier, lounger, mope |
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| damar | (noun) any of various hard resins from trees of the family Dipterocarpaceae and of the genus Agathis; especially the amboyna pine | Synonyms: dammar, dammar resin, gum dammar |
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| dammar | (noun) any of various hard resins from trees of the family Dipterocarpaceae and of the genus Agathis; especially the amboyna pine | Synonyms: damar, dammar resin, gum dammar |
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| dampener | (noun) a device that dampens or moistens something | Synonyms: moistener |
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| damper | (noun) a depressing restraint | - |
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| (noun) a device that decreases the amplitude of electronic, mechanical, acoustical, or aerodynamic oscillations | Synonyms: muffler |
| (noun) a movable iron plate that regulates the draft in a stove or chimney or furnace | - |
| dancer | (noun) a performer who dances professionally | Synonyms: professional dancer, terpsichorean |
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| (noun) a person who participates in a social gathering arranged for dancing (as a ball) | Synonyms: social dancer |
| dander | (noun) a feeling of anger and animosity | Synonyms: hackles |
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| (noun) small scales from animal skins or hair or bird feathers that can cause allergic reactions in some people | - |
| danger | (noun) a venture undertaken without regard to possible loss or injury | Synonyms: peril, risk |
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| (noun) a dangerous place | - |
| (noun) the condition of being susceptible to harm or injury | - |
| (noun) a cause of pain or injury or loss | - |
| danseur | (noun) a male ballet dancer who is the partner of a ballerina | Synonyms: danseur noble |
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| dapper | (adjective) marked by up-to-dateness in dress and manners | Synonyms: dashing, jaunty, natty, raffish, rakish, snappy, spiffy, spruce |
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| darner | (noun) a person who mends by darning | - |
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| darter | (noun) a person or other animal that moves abruptly and rapidly | - |
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| (noun) fish-eating bird of warm inland waters having a long flexible neck and slender sharp-pointed bill | Synonyms: anhinga, snakebird |
| dasymeter | (noun) densimeter consisting of a thin glass globe that is weighed in a gas to determine its density | - |
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| dauber | (noun) an unskilled painter | - |
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| daughter | (noun) a female human offspring | Synonyms: girl |
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| dawdler | (noun) someone who takes more time than necessary; someone who lags behind | Synonyms: drone, laggard, lagger, poke, trailer |
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| daydreamer | (noun) someone who indulges in idle or absentminded daydreaming | Synonyms: woolgatherer |
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| dayflower | (noun) any plant of the family Commelinaceae | Synonyms: spiderwort |
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| daystar | (noun) a planet (usually Venus) seen just before sunrise in the eastern sky | Synonyms: Lucifer, morning star, Phosphorus |
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| dealer | (noun) a firm engaged in trading | - |
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| (noun) a seller of illicit goods | - |
| (noun) the person who distributes the playing cards in a card game | - |
| (noun) someone who purchases and maintains an inventory of goods to be sold | Synonyms: bargainer, monger, trader |
| (noun) the major party to a financial transaction at a stock exchange; buys and sells for his own account | Synonyms: principal |
| dear | (adjective) with or in a close or intimate relationship | Synonyms: good, near |
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| (adjective) having a high price | Synonyms: costly, high-priced, pricey, pricy |
| (adjective) dearly loved | Synonyms: beloved, darling |
| (adjective) sincerely earnest | Synonyms: devout, earnest, heartfelt |
| (noun) a beloved person; used as terms of endearment | Synonyms: baby, beloved, darling, dearest, dearie, deary, honey, love, sweetheart, sweetie |
| (noun) a sweet innocent mild-mannered person (especially a child) | Synonyms: lamb |
| (adverb) at a great cost | Synonyms: dearly |
| (adverb) with affection | Synonyms: affectionately, dearly |
| debar | (verb) prevent from entering; keep out | Synonyms: bar, exclude |
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| (verb) prevent the occurrence of; prevent from happening; to protect from or to keep away anything undesirable; to ward off | Synonyms: avert, avoid, deflect, fend off, forefend, forfend, head off, obviate, stave off, ward off |
| (verb) bar temporarily; from school, office, etc. | Synonyms: suspend |
| debaser | (noun) a person who lowers the quality or character or value (as by adding cheaper metal to coins) | Synonyms: degrader |
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| debater | (noun) someone who engages in debate | Synonyms: arguer |
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| debaucher | (noun) someone who assaults others sexually | Synonyms: ravisher, violator |
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| debitor | (noun) a person who owes a creditor; someone who has the obligation of paying a debt | Synonyms: debtor |
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| debonair | (adjective) having a cheerful, lively, and self-confident air | Synonyms: chipper, debonaire, jaunty |
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| (adjective) having a sophisticated charm | Synonyms: debonaire, debonnaire, suave |
| debtor | (noun) a person who owes a creditor; someone who has the obligation of paying a debt | Synonyms: debitor |
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| debugger | (noun) a program that helps in locating and correcting programming errors | - |
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| decaliter | (noun) a metric unit of volume or capacity equal to 10 liters | Synonyms: dal, decalitre, dekaliter, dekalitre, dkl |
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| decameter | (noun) a metric unit of length equal to ten meters | Synonyms: dam, decametre, dekameter, dekametre, dkm |
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| decanter | (noun) a bottle with a stopper; for serving wine or water | Synonyms: carafe |
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| deceiver | (noun) someone who leads you to believe something that is not true | Synonyms: beguiler, cheat, cheater, slicker, trickster |
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| deciliter | (noun) a metric unit of volume equal to one tenth of a liter | Synonyms: decilitre, dl |
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| decimeter | (noun) a metric unit of length equal to one tenth of a meter | Synonyms: decimetre, dm |
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| decipher | (verb) read with difficulty | Synonyms: trace |
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| (verb) convert code into ordinary language | Synonyms: decode, decrypt |
| decipherer | (noun) a reader capable of reading and interpreting illegible or obscure text | - |
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| (noun) the kind of intellectual who converts messages from a code to plain text | Synonyms: decoder |
| decker | (noun) (often used in combinations) something constructed with multiple levels | - |
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| declarer | (noun) the bridge player in contract bridge who wins the bidding and can declare which suit is to be trumps | Synonyms: contractor |
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| (noun) someone who claims to speak the truth | Synonyms: affirmer, asserter, asseverator, avower |
| declinometer | (noun) an instrument for measuring magnetic declination | Synonyms: transit declinometer |
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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 |
| decolor | (verb) cause to become white or lighter in color | Synonyms: bleach, bleach out, decolorise, decolorize, decolour, decolourise, decolourize, discolorise, discolorize, discolourise |
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| decolour | (verb) cause to become white or lighter in color | Synonyms: bleach, bleach out, decolor, decolorise, decolorize, decolourise, decolourize, discolorise, discolorize, discolourise |
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| decor | (noun) decoration consisting of the layout and furnishings of a livable interior | Synonyms: interior decoration |
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| decorator | (noun) someone who decorates | Synonyms: ornamentalist |
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| (noun) a person who specializes in interior decoration | Synonyms: house decorator, interior decorator, room decorator |
| deer | (noun) distinguished from Bovidae by the male's having solid deciduous antlers | Synonyms: cervid |
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| deerstalker | (noun) a tight-fitting hat with visors front and back; formerly worn by hunters | - |
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| defalcator | (noun) someone who violates a trust by taking (money) for his own use | Synonyms: embezzler, peculator |
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| defamer | (noun) one who attacks the reputation of another by slander or libel | Synonyms: backbiter, libeler, maligner, slanderer, traducer, vilifier |
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| defaulter | (noun) a contestant who forfeits a match | - |
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| (noun) someone who fails to meet a financial obligation | Synonyms: deadbeat |
| (noun) someone who fails to make a required appearance in court | - |
| defecator | (noun) (obsolete) that which cleanses or purifies; especially, an apparatus for removing the feculencies of juices and syrups. | - |
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| (noun) a person who defecates | Synonyms: shitter, voider |
| defector | (noun) a person who abandons their duty (as on a military post) | Synonyms: deserter |
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| defender | (noun) a person who cares for persons or property | Synonyms: guardian, protector, shielder |
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| (noun) a fighter who holds out against attack | Synonyms: withstander |
| defer | (verb) yield to another's wish or opinion | Synonyms: accede, bow, give in, submit |
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| (verb) hold back to a later time | Synonyms: hold over, postpone, prorogue, put off, put over, remit, set back, shelve, table |
| defibrillator | (noun) an electronic device that administers an electric shock of preset voltage to the heart through the chest wall in an attempt to restore the normal rhythm of the heart during ventricular fibrillation | - |
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| defiler | (noun) a person or organization that causes pollution of the environment | Synonyms: polluter |
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| deflator | (noun) a statistical factor designed to remove the effect of inflation; inflation adjusted variables are in constant dollars | - |
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| deflector | (noun) a device intended to turn aside the flow of something (water or air or smoke etc) | - |
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| deflower | (verb) make imperfect | Synonyms: impair, mar, spoil, vitiate |
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| (verb) deprive of virginity | Synonyms: ruin |
| defoliator | (noun) an insect that strips the leaves from plants | - |
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| defrauder | (noun) a person who swindles you by means of deception or fraud | Synonyms: chiseler, chiseller, gouger, grifter, scammer, swindler |
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| defroster | (noun) heater that removes ice or frost (as from a windshield or a refrigerator or the wings of an airplane) | Synonyms: deicer |
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| degrader | (noun) a person who lowers the quality or character or value (as by adding cheaper metal to coins) | Synonyms: debaser |
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| degreaser | (noun) a chemical substance that dissolves water-insoluble substances, such as greases and oils. | - |
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| dehumidifier | (noun) an appliance to extract moisture from the air and make the environment more comfortable | - |
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| deicer | (noun) heater that removes ice or frost (as from a windshield or a refrigerator or the wings of an airplane) | Synonyms: defroster |
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| dejeuner | (noun) a midday meal | Synonyms: lunch, luncheon, tiffin |
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| dekaliter | (noun) a metric unit of volume or capacity equal to 10 liters | Synonyms: dal, decaliter, decalitre, dekalitre, dkl |
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| dekameter | (noun) a metric unit of length equal to ten meters | Synonyms: dam, decameter, decametre, dekametre, dkm |
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| delayer | (noun) a person who delays; to put off until later or cause to be late | - |
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| delimber | (noun) a machine for removing limbs from trees with a saw or flailing chains. | Synonyms: stroke delimber |
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| deliver | (verb) cause to be born | Synonyms: bear, birth, give birth, have |
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| (verb) deliver (a speech, oration, or idea) | Synonyms: present |
| (verb) pass down | Synonyms: render, return |
| (verb) utter (an exclamation, noise, etc.) | - |
| (verb) bring to a destination, make a delivery | - |
| (verb) throw or hurl from the mound to the batter, as in baseball | Synonyms: pitch |
| (verb) to surrender someone or something to another | Synonyms: fork out, fork over, fork up, hand over, render, turn in |
| (verb) relinquish possession or control over | Synonyms: cede, give up, surrender |
| (verb) carry out or perform | Synonyms: drive home |
| (verb) hand over to the authorities of another country | Synonyms: deport, extradite |
| (verb) free from harm or evil | Synonyms: rescue |
| (verb) save from sins | Synonyms: redeem, save |
| deliverer | (noun) a person who rescues you from harm or danger | Synonyms: rescuer, savior, saviour |
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| (noun) a person who gives up or transfers money or goods | - |
| (noun) someone employed to make deliveries | Synonyms: delivery boy, deliveryman |
| demander | (noun) a person who makes demands | - |
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| demeanor | (noun) (behavioral attributes) the way a person behaves toward other people | Synonyms: behavior, behaviour, conduct, demeanour, deportment |
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| demeanour | (noun) (behavioral attributes) the way a person behaves toward other people | Synonyms: behavior, behaviour, conduct, demeanor, deportment |
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| demisemiquaver | (noun) a musical note having the time value of a thirty-second of a whole note | Synonyms: thirty-second note |
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| demister | (noun) heater that removes mist from the windshield of a car | - |
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| demodulator | (noun) rectifier that extracts modulation from a radio carrier wave | Synonyms: detector |
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| demographer | (noun) a scientist who studies the growth and density of populations and their vital statistics | Synonyms: demographist, population scientist |
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| demonstrator | (noun) someone who participates in a public display of group feeling | Synonyms: protester |
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| (noun) someone who demonstrates an article to a prospective buyer | Synonyms: sales demonstrator |
| (noun) a teacher or teacher's assistant who demonstrates the principles that are being taught | - |
| demur | (noun) (law) a formal objection to an opponent's pleadings | Synonyms: demurral, demurrer |
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| (verb) object to | Synonyms: except |
| (verb) enter a demurrer | - |
| demurrer | (noun) a defendant's answer or plea denying the truth of the charges against him | Synonyms: defence, defense, denial |
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| (noun) (law) a formal objection to an opponent's pleadings | Synonyms: demur, demurral |
| (noun) (law) any pleading that attacks the legal sufficiency of the opponent's pleadings | - |
| denier | (noun) any of various former European coins of different denominations | - |
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| (noun) a unit of measurement for the fineness of silk or nylon or rayon | - |
| (noun) one who denies | - |
| denitrator | (noun) Any device used to remove nitrates or other nitrogen compounds, especially from water. | - |
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