| defy | (verb) challenge | Synonyms: dare |
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| (verb) resist or confront with resistance | Synonyms: hold, hold up, withstand |
| (verb) elude, especially in a baffling way | Synonyms: refuse, resist |
| dehumidifier | (noun) an appliance to extract moisture from the air and make the environment more comfortable | - |
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| dehumidify | (verb) make less humid | - |
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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 | - |
| deify | (verb) exalt to the position of a God | - |
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| (verb) consider as a god or godlike | - |
| delf | (noun) an excavation; usually a quarry or mine | - |
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| delft | (noun) a style of glazed earthenware; usually white with blue decoration | - |
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| delightful | (adjective) greatly pleasing or entertaining | Synonyms: delicious |
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| delightfully | (adverb) in a delightful manner | - |
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| demulsify | (verb) break down into components | - |
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| (verb) cause to demulsify | - |
| demystify | (verb) make less mysterious or remove the mystery from | - |
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| denazification | (noun) social process of removing Nazis from official positions and giving up any allegiance to Nazism | Synonyms: de-Nazification |
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| denazify | (verb) free from Nazi ideology or detach from Nazi allegiance | - |
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| dendriform | (adjective) resembling a tree in form and branching structure | Synonyms: arboreal, arboreous, arborescent, arboresque, arboriform, dendroid, dendroidal, tree-shaped, treelike |
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| denitrify | (verb) remove nitrogen from | - |
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| densification | (noun) an increase in the density of something | Synonyms: compaction, compression, concretion |
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| dentifrice | (noun) a substance for cleaning the teeth; applied with a toothbrush | - |
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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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| despiteful | (adjective) showing malicious ill will and a desire to hurt; motivated by spite | Synonyms: spiteful, vindictive |
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| despitefully | (adverb) in a maliciously spiteful manner | Synonyms: spitefully |
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| dessertspoonful | (noun) as much as a dessert spoon will hold | Synonyms: dessertspoon |
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| desulfurize | (verb) remove sulfur from | Synonyms: desulphurize |
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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 | - |
| detoxify | (verb) treat for alcohol or drug dependence | Synonyms: detox |
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| (verb) remove poison from | Synonyms: detoxicate |
| 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 |
| devitrify | (verb) become crystalline | - |
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| (verb) make (glassy materials) brittle or opaque | - |
| differ | (verb) be of different opinions | Synonyms: disagree, dissent, take issue |
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| (verb) be different | - |
| difference | (noun) the quality of being unlike or dissimilar | - |
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| (noun) a disagreement or argument about something important | Synonyms: conflict, difference of opinion, dispute |
| (noun) a variation that deviates from the standard or norm | Synonyms: departure, deviation, divergence |
| (noun) the number that remains after subtraction; the number that when added to the subtrahend gives the minuend | Synonyms: remainder |
| (noun) a significant change | - |
| different | (adjective) unlike in nature or quality or form or degree | - |
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| (adjective) distinctly separate from the first | - |
| (adjective) differing from all others; not ordinary | - |
| (adjective) distinct or separate | - |
| differentia | (noun) distinguishing characteristics (especially in different species of a genus) | - |
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| differentiable | (adjective) possessing a differential coefficient or derivative | - |
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| (adjective) capable of being perceived as different | - |
| differential | (adjective) relating to or showing a difference | - |
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| (adjective) involving or containing one or more derivatives | - |
| (noun) a bevel gear that permits rotation of two shafts at different speeds; used on the rear axle of automobiles to allow wheels to rotate at different speeds on curves | Synonyms: differential gear |
| (noun) a quality that differentiates between similar things | - |
| (noun) the result of mathematical differentiation; the instantaneous change of one quantity relative to another; df(x)/dx | Synonyms: derivative, derived function, differential coefficient, first derivative |
| differentially | (adverb) in a differential manner | - |
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| differentiate | (verb) become distinct and acquire a different character | - |
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| (verb) become different during development | - |
| (verb) evolve so as to lead to a new species or develop in a way most suited to the environment | Synonyms: specialise, specialize, speciate |
| (verb) calculate a derivative; take the derivative | - |
| (verb) mark as different | Synonyms: distinguish, secern, secernate, separate, severalise, severalize, tell, tell apart |
| (verb) be a distinctive feature, attribute, or trait; sometimes in a very positive sense | Synonyms: distinguish, mark |
| differentiated | (adjective) made different (especially in the course of development) or shown to be different | - |
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| (adjective) exhibiting biological specialization; adapted during development to a specific function or environment | - |
| differentiation | (noun) the mathematical process of obtaining the derivative of a function | - |
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| (noun) a discrimination between things as different and distinct on the basis of their characteristics or attributes | Synonyms: distinction |
| (noun) (biology) the structural adaptation of some body part for a particular function | Synonyms: specialisation, specialization |
| differentiator | (noun) a person who (or that which) differentiates | Synonyms: discriminator |
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| differently | (adverb) in another and different manner | Synonyms: otherwise |
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| 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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| difflugia | (noun) a protozoan with an ovoid shell of cemented sand grains | - |
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| diffract | (verb) undergo diffraction | - |
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| diffraction | (noun) when light passes sharp edges or goes through narrow slits the rays are deflected and produce fringes of light and dark bands | - |
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| diffuse | (adjective) (of light) transmitted from a broad light source or reflected | Synonyms: diffused, soft |
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| (adjective) spread out; not concentrated in one place | - |
| (adjective) lacking conciseness | - |
| (verb) cause to become widely known | Synonyms: broadcast, circularise, circularize, circulate, disperse, disseminate, distribute, pass around, propagate, spread |
| (verb) spread or diffuse through | Synonyms: imbue, interpenetrate, penetrate, permeate, pervade, riddle |
| (verb) move outward | Synonyms: fan out, spread, spread out |
| diffused | (adjective) (of light) transmitted from a broad light source or reflected | Synonyms: diffuse, soft |
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| (adjective) (of light rays) subjected to scattering by reflection from a rough surface or transmission through a translucent material | - |
| diffusely | (adverb) in a diffuse manner | - |
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| diffuseness | (noun) the spatial property of being spread out over a wide area or through a large volume | - |
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| diffuser | (noun) optical device that distributes the light of a lamp evenly | Synonyms: diffusor |
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| (noun) baffle that distributes sound waves evenly | Synonyms: diffusor |
| diffusing | (adjective) spreading by diffusion | Synonyms: diffusive, dispersive, disseminative |
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| diffusion | (noun) the act of dispersing or diffusing something | Synonyms: dispersal, dispersion, dissemination |
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| (noun) the property of being diffused or dispersed | Synonyms: dissemination |
| (noun) the spread of social institutions (and myths and skills) from one society to another | - |
| (noun) (physics) the process in which there is movement of a substance from an area of high concentration of that substance to an area of lower concentration | - |
| diffusive | (adjective) spreading by diffusion | Synonyms: diffusing, dispersive, disseminative |
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| diffusor | (noun) optical device that distributes the light of a lamp evenly | Synonyms: diffuser |
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| (noun) baffle that distributes sound waves evenly | Synonyms: diffuser |
| diflunisal | (noun) nonsteroidal anti-inflammatory (trade name Dolobid) used to treat arthritis and other inflammatory conditions | Synonyms: Dolobid |
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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 |
| dignify | (verb) raise the status of | - |
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| (verb) confer dignity or honor upon | Synonyms: ennoble |
| dignifying | (adjective) investing with dignity or honor | Synonyms: ennobling |
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| dinoflagellate | (noun) chiefly marine protozoa having two flagella; a chief constituent of plankton | - |
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| direful | (adjective) causing fear or dread or terror | Synonyms: awful, dire, dread, dreaded, dreadful, fearful, fearsome, frightening, horrendous, horrific, terrible |
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| direfully | (adverb) in a direful manner | - |
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| disaffect | (verb) arouse hostility or indifference in where there had formerly been love, affection, or friendliness | Synonyms: alienate, estrange |
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| disaffected | (adjective) discontented as toward authority | Synonyms: ill-affected, malcontent, rebellious |
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| disaffection | (noun) disloyalty to the government or to established authority | - |
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| (noun) the feeling of being alienated from other people | Synonyms: alienation, estrangement |
| disaffirmation | (noun) the act of asserting that something alleged is not true | Synonyms: denial |
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| disafforest | (verb) remove the trees from | Synonyms: deforest, disforest |
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| disbelief | (noun) doubt about the truth of something | Synonyms: incredulity, mental rejection, scepticism, skepticism |
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| (noun) a rejection of belief | Synonyms: unbelief |
| disciform | (adjective) having a round or oval shape like a disc | - |
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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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| discomfort | (noun) an uncomfortable feeling of mental painfulness or distress | Synonyms: irritation, soreness |
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| (noun) the state of being tense and feeling pain | Synonyms: uncomfortableness |
| 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 |
| disdainful | (adjective) expressing extreme contempt | Synonyms: contemptuous, insulting, scornful |
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| (adjective) having or showing arrogant superiority to and disdain of those one views as unworthy | Synonyms: haughty, imperious, lordly, overbearing, prideful, sniffy, supercilious, swaggering |
| disdainfully | (adverb) without respect; in a disdainful manner | Synonyms: contemptuously, contumeliously, scornfully |
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| (adverb) in a proud and domineering manner | Synonyms: cavalierly |
| disdainfulness | (noun) the trait of displaying arrogance by patronizing those considered inferior | Synonyms: condescension, superciliousness |
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| disenfranchise | (verb) deprive of voting rights | Synonyms: disfranchise |
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| disenfranchised | (adjective) deprived of the rights of citizenship especially the right to vote | Synonyms: disfranchised, voiceless, voteless |
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| disenfranchisement | (noun) the act of withdrawing certification or terminating a franchise | - |
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| disfavor | (noun) an inclination to withhold approval from some person or group | Synonyms: disapproval, disfavour, dislike |
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| (noun) the state of being out of favor | Synonyms: disfavour |
| (verb) put at a disadvantage; hinder, harm | Synonyms: disadvantage, disfavour |
| disfavour | (noun) an inclination to withhold approval from some person or group | Synonyms: disapproval, disfavor, dislike |
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| (noun) the state of being out of favor | Synonyms: disfavor |
| (verb) put at a disadvantage; hinder, harm | Synonyms: disadvantage, disfavor |
| 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 |
| disfluency | (noun) lack of skillfulness in speaking or writing | - |
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| disforest | (verb) remove the trees from | Synonyms: deforest, disafforest |
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| disforestation | (noun) the removal of trees | Synonyms: deforestation |
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| disfranchise | (verb) deprive of voting rights | Synonyms: disenfranchise |
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| disfranchised | (adjective) deprived of the rights of citizenship especially the right to vote | Synonyms: disenfranchised, voiceless, voteless |
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| disfranchisement | (noun) the discontinuation of a franchise; especially the discontinuation of the right to vote | - |
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| disfunction | (noun) (medicine) any disturbance in the functioning of an organ or body part or a disturbance in the functioning of a social group | Synonyms: dysfunction |
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| disgraceful | (adjective) (used of conduct or character) deserving or bringing disgrace or shame | Synonyms: black, ignominious, inglorious, opprobrious, shameful |
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| (adjective) giving offense to moral sensibilities and injurious to reputation | Synonyms: scandalous, shameful, shocking |
| disgracefully | (adverb) in a dishonorable manner or to a dishonorable degree | Synonyms: discreditably, dishonorably, dishonourably, ignominiously, ingloriously, shamefully |
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| disgracefulness | (noun) unworthiness meriting public disgrace and dishonor | Synonyms: ignominiousness, shamefulness |
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| disgustful | (adjective) highly offensive; arousing aversion or disgust | Synonyms: disgusting, distasteful, foul, loathly, loathsome, repellant, repellent, repelling, revolting, skanky, wicked, yucky |
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