| 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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| dessertspoonful | (noun) as much as a dessert spoon will hold | Synonyms: dessertspoon |
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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 |
| 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 | - |
| differentia | (noun) distinguishing characteristics (especially in different species of a genus) | - |
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| differential | (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 |
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| (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 |
| 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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| 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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| difflugia | (noun) a protozoan with an ovoid shell of cemented sand grains | - |
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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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| 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 |
| 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 | - |
| 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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| dinoflagellate | (noun) chiefly marine protozoa having two flagella; a chief constituent of plankton | - |
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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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| 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 |
| discomfited | (noun) people who are defeated | Synonyms: defeated |
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| 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 |
| disdainfulness | (noun) the trait of displaying arrogance by patronizing those considered inferior | Synonyms: condescension, superciliousness |
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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 |
| 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 |
| 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 |
| 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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| disforestation | (noun) the removal of trees | Synonyms: deforestation |
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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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| disgracefulness | (noun) unworthiness meriting public disgrace and dishonor | Synonyms: ignominiousness, shamefulness |
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| dishful | (noun) the quantity that a dish will hold | Synonyms: dish |
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| disinfectant | (noun) an agent (as heat or radiation or a chemical) that destroys microorganisms that might carry disease | Synonyms: antimicrobial, antimicrobic, germicide |
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| disinfection | (noun) treatment to destroy harmful microorganisms | - |
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| disinfector | (noun) an apparatus for applying disinfectants. | - |
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| disinfestation | (noun) the activity of getting rid of vermin | - |
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| disinflation | (noun) a reduction of prices intended to improve the balance of payments | - |
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| disinformation | (noun) misinformation that is deliberately disseminated in order to influence or confuse rivals (foreign enemies or business competitors etc.) | - |
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| disproof | (noun) the act of determining that something is false | Synonyms: falsification, falsifying, refutal, refutation |
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| (noun) any evidence that helps to establish the falsity of something | Synonyms: falsification, refutation |
| disqualification | (noun) the act of preventing someone from participating by finding them unqualified | - |
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| (noun) unfitness that bars you from participation | - |
| dissatisfaction | (noun) the feeling of being displeased and discontent | - |
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| distaff | (noun) the staff on which wool or flax is wound before spinning | - |
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| (noun) the sphere of work by women | - |
| distastefulness | (noun) the quality of being offensive | Synonyms: odiousness, offensiveness |
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| (noun) extreme unpalatability to the mouth | Synonyms: disgustingness, nauseatingness, sickeningness, unsavoriness |
| distressfulness | (noun) the quality of arousing fear or distress | Synonyms: seriousness |
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| distrustfulness | (noun) the trait of not trusting others | Synonyms: distrust, mistrust |
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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 | - |
| dobsonfly | (noun) large soft-bodied insect having long slender mandibles in the male; aquatic larvae often used as bait | Synonyms: Corydalus cornutus, dobson, dobson fly |
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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 | - |
| 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 |
| dolefulness | (noun) sadness caused by grief or affliction | - |
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| 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 |
| doofus | (noun) a stupid incompetent person | Synonyms: dimwit, half-wit, nitwit |
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| doorframe | (noun) the frame that supports a door | Synonyms: doorcase |
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| dorsiflexion | (noun) the act of bending backward (of the body or a body part) | - |
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| doubtfulness | (noun) uncertainty about the truth or factuality or existence of something | Synonyms: doubt, dubiousness, question |
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| (noun) the state of being unsure of something | Synonyms: doubt, dubiety, dubiousness, incertitude, uncertainty |
| downdraft | (noun) a strong downward air current | - |
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| downfall | (noun) a sudden decline in strength or number or importance | Synonyms: fall |
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| (noun) failure that results in a loss of position or reputation | Synonyms: ruin, ruination |
| (noun) the falling to earth of any form of water (rain or snow or hail or sleet or mist) | Synonyms: precipitation |
| downshift | (noun) a change to a lower gear in a car or bicycle | - |
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| (noun) a change from a financially rewarding but stressful career to a less well paid but more fulfilling one | - |
| draff | (noun) the residue of malt and grain which remains in the mash-kettle after the mashing and lautering process. | Synonyms: brewer's grain, spent grain |
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| draft | (noun) the act of moving a load by drawing or pulling | Synonyms: draught, drawing |
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| (noun) a large and hurried swallow | Synonyms: draught, gulp, swig |
| (noun) compulsory military service | Synonyms: conscription, muster, selective service |
| (noun) a dose of liquid medicine | Synonyms: draught |
| (noun) a preliminary sketch of a design or picture | Synonyms: rough drawing |
| (noun) a regulator for controlling the flow of air in a fireplace | - |
| (noun) the depth of a vessel's keel below the surface (especially when loaded) | Synonyms: draught |
| (noun) any of the various versions in the development of a written work | Synonyms: draft copy |
| (noun) a serving of drink (usually alcoholic) drawn from a keg | Synonyms: draught, potation, tipple |
| (noun) a current of air (usually coming into a chimney or room or vehicle) | Synonyms: draught |
| (noun) a document ordering the payment of money; drawn by one person or bank on another | Synonyms: bill of exchange, order of payment |
| draftee | (noun) someone who is drafted into military service | Synonyms: conscript, inductee |
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| drafter | (noun) a writer of a draft | - |
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| drafting | (noun) the creation of artistic pictures or diagrams | Synonyms: draftsmanship, drawing |
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| (noun) writing a first version to be filled out and polished later | - |
| (noun) the craft of drawing blueprints | Synonyms: mechanical drawing |
| draftsman | (noun) a skilled worker who draws plans of buildings or machines | Synonyms: draftsperson, draughtsman |
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| (noun) an artist skilled at drawing | Synonyms: drawer |
| draftsmanship | (noun) the creation of artistic pictures or diagrams | Synonyms: drafting, drawing |
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| draftsperson | (noun) a skilled worker who draws plans of buildings or machines | Synonyms: draftsman, draughtsman |
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| dragonfly | (noun) slender-bodied non-stinging insect having iridescent wings that are outspread at rest; adults and nymphs feed on mosquitoes etc. | Synonyms: darning needle, devil's darning needle, mosquito hawk, sewing needle, skeeter hawk, snake doctor, snake feeder |
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| drawknife | (noun) a woodworker's knife to shave surfaces | Synonyms: drawshave |
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| dreadfulness | (noun) a quality of extreme unpleasantness | Synonyms: awfulness, horridness, terribleness |
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| drift | (noun) a horizontal (or nearly horizontal) passageway in a mine | Synonyms: gallery, heading |
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| (noun) the pervading meaning or tenor | Synonyms: purport |
| (noun) a general tendency to change (as of opinion) | Synonyms: movement, trend |
| (noun) a large mass of material that is heaped up by the wind or by water currents | - |
| (noun) a force that moves something along | Synonyms: impetus, impulsion |
| (noun) the gradual departure from an intended course due to external influences (as a ship or plane) | - |
| (noun) a process of linguistic change over a period of time | - |
| driftage | (noun) the deviation (by a vessel or aircraft) from its intended course due to drifting | - |
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| drifter | (noun) a wanderer who has no established residence or visible means of support | Synonyms: clochard, floater, vagabond, vagrant |
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| 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 | - |
| drifting | (noun) aimless wandering from place to place | - |
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| driftwood | (noun) wood that is floating or that has been washed ashore | - |
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| driveshaft | (noun) a rotating shaft that transmits power from the engine to the point of application | - |
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| 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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| duff | (noun) a stiff flour pudding steamed or boiled usually and containing e.g. currants and raisins and citron | Synonyms: plum duff |
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| duffel | (noun) a coarse heavy woolen fabric | Synonyms: duffle |
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| (noun) a large cylindrical bag of heavy cloth; for carrying personal belongings | Synonyms: duffel bag, duffle, duffle bag |
| duffer | (noun) an incompetent or clumsy person | - |
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| duffle | (noun) a coarse heavy woolen fabric | Synonyms: duffel |
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| (noun) a large cylindrical bag of heavy cloth; for carrying personal belongings | Synonyms: duffel, duffel bag, duffle bag |
| dustpanful | (noun) the quantity that a dustpan will hold | Synonyms: dustpan |
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| dutifulness | (noun) piety by virtue of devotion to duty | - |
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| dwarf | (noun) a plant or animal that is atypically small | - |
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| (noun) a person who is markedly small | Synonyms: midget, nanus |
| (noun) a legendary creature resembling a tiny old man; lives in the depths of the earth and guards buried treasure | Synonyms: gnome |
| 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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