| dandified | (adjective) affecting extreme elegance in dress and manner | Synonyms: dandyish, foppish |
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| dealfish | (noun) deep-sea ribbonfish | Synonyms: Trachipterus arcticus |
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| debriefing | (noun) report of a mission or task | - |
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| decalcification | (noun) loss of calcium from bones or teeth | - |
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| declassification | (noun) reduction or removal by the government of restrictions on a classified document or weapon | - |
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| declassified | (adjective) having had security classification removed | - |
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| defiance | (noun) a defiant act | - |
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| (noun) intentionally contemptuous behavior or attitude | Synonyms: rebelliousness |
| (noun) a hostile challenge | - |
| defiant | (adjective) boldly resisting authority or an opposing force | Synonyms: noncompliant |
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| defiantly | (adverb) in a rebellious manner | Synonyms: contumaciously, rebelliously |
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| defibrillate | (verb) stop the fibrillation and restore normal contractions, usually by means of electric shocks | - |
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| defibrillation | (noun) treatment by stopping fibrillation of heart muscles (usually by electric shock delivered by a defibrillator) | - |
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| 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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| defibrinate | (verb) remove fibrin from (blood) | - |
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| deficiency | (noun) lack of an adequate quantity or number | Synonyms: inadequacy, insufficiency |
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| (noun) the state of needing something that is absent or unavailable | Synonyms: lack, want |
| deficient | (adjective) of a quantity not able to fulfill a need or requirement | Synonyms: insufficient |
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| (adjective) inadequate in amount or degree | Synonyms: lacking, wanting |
| (adjective) falling short of some prescribed norm | Synonyms: inferior, substandard |
| deficit | (noun) the property of being an amount by which something is less than expected or required | Synonyms: shortage, shortfall |
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| (noun) an excess of liabilities over assets (usually over a certain period) | - |
| (noun) (sports) the score by which a team or individual is losing | - |
| (noun) a deficiency or failure in neurological or mental functioning | - |
| defilade | (noun) the arrangement of defensive fortifications to protect against enemy fire | - |
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| defile | (noun) a narrow pass (especially one between mountains) | Synonyms: gorge |
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| (verb) spot, stain, or pollute | Synonyms: befoul, foul, maculate |
| (verb) make dirty or spotty, as by exposure to air; also used metaphorically | Synonyms: maculate, stain, sully, tarnish |
| (verb) place under suspicion or cast doubt upon | Synonyms: cloud, corrupt, sully, taint |
| defiled | (adjective) morally blemished; stained or impure | Synonyms: maculate |
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| defilement | (noun) the state of being polluted | Synonyms: befoulment, pollution |
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| defiler | (noun) a person or organization that causes pollution of the environment | Synonyms: polluter |
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| definability | (noun) the quality or state of being capable of being defined, limited, or explained. | - |
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| definable | (adjective) capable of being defined, limited, or explained | - |
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| define | (verb) give a definition for the meaning of a word | - |
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| (verb) decide upon or fix definitely | Synonyms: determine, fix, limit, set, specify |
| (verb) determine the essential quality of | Synonyms: delimit, delimitate, delineate, specify |
| (verb) determine the nature of | - |
| (verb) show the form or outline of | Synonyms: delineate |
| defined | (adjective) clearly characterized or delimited | - |
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| (adjective) showing clearly the outline or profile or boundary | Synonyms: outlined |
| defining | (noun) any process serving to define the shape of something | Synonyms: shaping |
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| definite | (adjective) precise; explicit and clearly defined | - |
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| (adjective) known for certain | - |
| definitely | (adverb) without question and beyond doubt | Synonyms: by all odds, decidedly, emphatically, in spades, unquestionably |
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| definiteness | (noun) the quality of being predictable with great confidence | Synonyms: determinateness |
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| definition | (noun) clarity of outline | - |
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| (noun) a concise explanation of the meaning of a word or phrase or symbol | - |
| definitive | (adjective) supplying or being a final or conclusive settlement | Synonyms: determinate |
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| (adjective) clearly defined or formulated | Synonyms: unequivocal |
| (adjective) of recognized authority or excellence | Synonyms: authoritative |
| definitors | (noun) council in a religious order who provide counsel and assistance to the superiors general and provincial superior of their order. | - |
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| dehumidifier | (noun) an appliance to extract moisture from the air and make the environment more comfortable | - |
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| deific | (adjective) characterized by divine or godlike nature | - |
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| deification | (noun) the elevation of a person (as to the status of a god) | Synonyms: apotheosis, exaltation |
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| (noun) an embodiment of the qualities of a god | - |
| (noun) the condition of being treated like a god | - |
| denazification | (noun) social process of removing Nazis from official positions and giving up any allegiance to Nazism | Synonyms: de-Nazification |
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| densification | (noun) an increase in the density of something | Synonyms: compaction, compression, concretion |
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| deossification | (noun) the loss of the mineral content of bone tissue | - |
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| desertification | (noun) the gradual transformation of habitable land into desert; is usually caused by climate change or by destructive use of the land | - |
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| detoxification | (noun) treatment for poisoning by neutralizing the toxic properties (normally a function of the liver) | - |
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| (noun) a treatment for addiction to drugs or alcohol intended to remove the physiological effects of the addictive substances | - |
| devilfish | (noun) extremely large pelagic tropical ray that feeds on plankton and small fishes; usually harmless but its size make it dangerous if harpooned | Synonyms: manta, manta ray |
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| (noun) bottom-living cephalopod having a soft oval body with eight long tentacles | Synonyms: octopus |
| (noun) medium-sized greyish-black whale of the northern Pacific | Synonyms: Eschrichtius gibbosus, Eschrichtius robustus, gray whale, grey whale |
| difficult | (adjective) not easy; requiring great physical or mental effort to accomplish or comprehend or endure | Synonyms: hard |
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| (adjective) hard to control | Synonyms: unmanageable |
| difficultness | (noun) the quality of being almost beyond one's ability to deal with and requiring a great effort to achieve a positive result | Synonyms: difficulty |
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| difficulty | (noun) an effort that is inconvenient | Synonyms: trouble |
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| (noun) the quality of being almost beyond one's ability to deal with and requiring a great effort to achieve a positive result | Synonyms: difficultness |
| diffidence | (noun) lack of self-confidence | Synonyms: self-distrust, self-doubt |
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| diffident | (adjective) lacking self-confidence | Synonyms: shy, timid, unsure |
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| (adjective) showing modest reserve | - |
| diffidently | (adverb) in a diffident manner | - |
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| dignified | (adjective) having or expressing dignity; especially formality or stateliness in bearing or appearance | - |
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| (adjective) having or showing self-esteem | Synonyms: self-respectful, self-respecting |
| disaffirmation | (noun) the act of asserting that something alleged is not true | Synonyms: denial |
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| discomfit | (verb) cause to lose one's composure | Synonyms: discompose, disconcert, untune, upset |
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| discomfited | (adjective) disappointingly unsuccessful | Synonyms: defeated, disappointed, foiled, frustrated, thwarted |
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| (noun) people who are defeated | Synonyms: defeated |
| discomfiture | (noun) anxious embarrassment | Synonyms: discomposure, disconcertion, disconcertment |
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| disconfirming | (adjective) not indicating the presence of microorganisms or disease or a specific condition | Synonyms: negative |
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| (adjective) establishing as invalid or untrue | Synonyms: invalidating |
| disfiguration | (noun) the act of damaging the appearance or surface of something | Synonyms: defacement, disfigurement, mutilation |
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| (noun) an appearance that has been spoiled or is misshapen | Synonyms: deformity, disfigurement |
| disfigure | (verb) mar or spoil the appearance of | Synonyms: blemish, deface |
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| disfigured | (adjective) having the appearance spoiled | - |
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| disfigurement | (noun) the act of damaging the appearance or surface of something | Synonyms: defacement, disfiguration, mutilation |
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| (noun) an appearance that has been spoiled or is misshapen | Synonyms: deformity, disfiguration |
| disqualification | (noun) the act of preventing someone from participating by finding them unqualified | - |
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| (noun) unfitness that bars you from participation | - |
| disqualified | (adjective) disqualified by law or rule or provision | - |
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| (adjective) barred from competition for violation of rules | - |
| dissatisfied | (adjective) in a state of sulky dissatisfaction | Synonyms: disgruntled |
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| disulfiram | (noun) a drug (trade name Antabuse) used in the treatment of alcoholism; causes nausea and vomiting if alcohol is ingested | Synonyms: Antabuse |
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| diversification | (noun) the act of introducing variety (especially in investments or in the variety of goods and services offered) | Synonyms: variegation |
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| (noun) the condition of being varied | - |
| diversified | (adjective) having variety of character or form or components; or having increased variety | - |
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| doctorfish | (noun) surgeon fish of the West Indies | Synonyms: Acanthurus chirurgus, doctor-fish |
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| dogfight | (noun) a violent fight between dogs (sometimes organized illegally for entertainment and gambling) | - |
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| (noun) an aerial engagement between fighter planes | - |
| (noun) disorderly fighting | Synonyms: hassle, rough-and-tumble, scuffle, tussle |
| (noun) a fiercely disputed contest | - |
| (verb) engage in an aerial battle with another fighter plane | - |
| (verb) arrange for an illegal dogfight | - |
| dogfighter | (noun) a fighter pilot who engages in an aerial dogfights | - |
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| dogfish | (noun) any of several small sharks | - |
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| (noun) primitive long-bodied carnivorous freshwater fish with a very long dorsal fin; found in sluggish waters of North America | Synonyms: Amia calva, bowfin, grindle |
| dollarfish | (noun) small food fish of Atlantic coast | Synonyms: Poronotus triacanthus |
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| (noun) any of several silvery marine fishes with very flat bodies | Synonyms: Atlantic moonfish, horse-head, horsefish, horsehead, moonfish, Selene setapinnis |
| dolphinfish | (noun) large slender food and game fish widely distributed in warm seas (especially around Hawaii) | Synonyms: dolphin, mahimahi |
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| (noun) the lean flesh of a saltwater fish found in warm waters (especially in Hawaii) | Synonyms: mahimahi |
| downfield | (adjective) located at, or relatively closer to, the defending team's end of the playing field | - |
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| (adverb) in the direction of the defending team's end of the playing field | - |
| driftfish | (noun) small (6 inches) tropical butterfishes found worldwide | - |
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| (noun) larger butterfishes of the western Atlantic from the New York area to the northern Gulf of Mexico | - |
| drumfire | (noun) intense and continuous artillery fire | Synonyms: cannonade |
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| drumfish | (noun) small to medium-sized bottom-dwelling food and game fishes of shallow coastal and fresh waters that make a drumming noise | Synonyms: drum |
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| dwarfish | (adjective) atypically small | - |
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| dwarfishness | (noun) the quality of being built like a dwarf | - |
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| dwarfism | (noun) a genetic abnormality resulting in short stature | Synonyms: nanism |
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| edification | (noun) uplifting enlightenment | Synonyms: sophistication |
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| edifice | (noun) a structure that has a roof and walls and stands more or less permanently in one place | Synonyms: building |
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| edified | (adjective) instructed and encouraged in moral, intellectual, and spiritual improvement | - |
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| efficacious | (adjective) marked by qualities giving the power to produce an intended effect | - |
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| (adjective) producing or capable of producing an intended result or having a striking effect | Synonyms: effective, effectual |
| efficaciously | (adverb) in an effective manner | Synonyms: effectively |
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| efficaciousness | (noun) capacity or power to produce a desired effect | Synonyms: efficacy |
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| efficacy | (noun) capacity or power to produce a desired effect | Synonyms: efficaciousness |
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| efficiency | (noun) skillfulness in avoiding wasted time and effort | - |
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| (noun) the ratio of the output to the input of any system | - |
| efficient | (adjective) being effective without wasting time or effort or expense | - |
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| (adjective) able to accomplish a purpose; functioning effectively | Synonyms: effective |
| efficiently | (adverb) with efficiency; in an efficient manner | Synonyms: expeditiously |
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| effigy | (noun) a representation of a person (especially in the form of sculpture) | Synonyms: image, simulacrum |
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| electrification | (noun) the activity of thrilling or markedly exciting some person or group | - |
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| (noun) the act of providing electricity | - |
| elfin | (adjective) relating to or made or done by or as if by an elf | - |
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| (adjective) usually good-naturedly mischievous | Synonyms: elfish, elvish |
| (adjective) small and delicate | Synonyms: elflike |
| (adjective) suggestive of an elf in strangeness and otherworldliness | Synonyms: fey |
| elfish | (adjective) usually good-naturedly mischievous | Synonyms: elfin, elvish |
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| emulsifier | (noun) a surface-active agent that promotes the formation of an emulsion | - |
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| enfilade | (noun) gunfire directed along the length rather than the breadth of a formation | Synonyms: enfilade fire |
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| (verb) rake or be in a position to rake with gunfire in a lengthwise direction | - |
| exemplification | (noun) a representational or typifying form or model | Synonyms: typification |
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| (noun) showing by example | Synonyms: illustration |
| exfiltrate | (verb) escape furtively, as from an area under enemy control | - |
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| (verb) transfer secretly out of an area under enemy control | - |
| falsifiable | (adjective) capable of being tested (verified or falsified) by experiment or observation | Synonyms: confirmable, verifiable |
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| falsification | (noun) the act of rendering something false as by fraudulent changes (of documents or measures etc.) or counterfeiting | Synonyms: falsehood |
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| (noun) the act of determining that something is false | Synonyms: disproof, falsifying, refutal, refutation |
| (noun) a willful perversion of facts | Synonyms: misrepresentation |
| (noun) any evidence that helps to establish the falsity of something | Synonyms: disproof, refutation |
| falsifier | (noun) someone who falsifies | - |
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| faultfinder | (noun) someone who is critical of the motives of others | Synonyms: cynic |
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| faultfinding | (adjective) tending to find and call attention to faults | Synonyms: captious |
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| (adjective) tending to make moral judgments or judgments based on personal opinions | - |
| (noun) persistent petty and unjustified criticism | Synonyms: carping |
| feetfirst | (adverb) with the feet foremost | - |
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