| deathbed | (noun) the bed on which a person dies | - |
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| (noun) the last few hours before death | - |
| deathblow | (noun) the blow that kills (usually mercifully) | Synonyms: coup de grace |
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| deathless | (adjective) never dying | Synonyms: undying |
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| deathlike | (adjective) having the physical appearance of death | Synonyms: deathly |
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| deathly | (adjective) having the physical appearance of death | Synonyms: deathlike |
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| (adjective) causing or capable of causing death | Synonyms: deadly, mortal |
| (adverb) to a degree resembling death | - |
| (adverb) to an extreme degree | Synonyms: exceedingly, extremely, super |
| deathrate | (noun) the ratio of deaths in an area to the population of that area; expressed per 1000 per year | Synonyms: death rate, fatality rate, mortality, mortality rate |
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| deathtrap | (noun) any structure that is very unsafe; where people are likely to be killed | - |
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| deathwatch | (noun) bores through wood making a ticking sound popularly thought to presage death | Synonyms: deathwatch beetle, Xestobium rufovillosum |
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| (noun) minute wingless psocopterous insects injurious to books and papers | Synonyms: book louse, booklouse, Liposcelis divinatorius |
| deb | (noun) a young woman making her debut into society | Synonyms: debutante |
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| debacle | (noun) a sound defeat | Synonyms: drubbing, slaughter, thrashing, trouncing, walloping, whipping |
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| (noun) a sudden and violent collapse | Synonyms: fiasco |
| (noun) flooding caused by a tumultuous breakup of ice in a river during the spring or summer | - |
| 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 |
| debark | (verb) go ashore | Synonyms: disembark, set down |
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| debarkation | (noun) the act of passengers and crew getting off of a ship or aircraft | Synonyms: disembarkation, disembarkment |
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| debarment | (noun) the act of prevention by legal means | - |
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| (noun) the state of being debarred (excluded from enjoying certain possessions or rights or practices) | - |
| debase | (verb) lower in value by increasing the base-metal content | Synonyms: alloy |
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| (verb) corrupt, debase, or make impure by adding a foreign or inferior substance; often by replacing valuable ingredients with inferior ones | Synonyms: adulterate, dilute, load, stretch |
| (verb) corrupt morally or by intemperance or sensuality | Synonyms: corrupt, debauch, demoralise, demoralize, deprave, misdirect, pervert, profane, subvert, vitiate |
| debased | (adjective) ruined in character or quality | Synonyms: corrupted, vitiated |
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| (adjective) mixed with impurities | Synonyms: adulterate, adulterated |
| (adjective) lowered in value | Synonyms: degraded, devalued |
| debasement | (noun) changing to a lower state (a less respected state) | Synonyms: degradation |
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| (noun) being mixed with extraneous material; the product of adulterating | Synonyms: adulteration |
| 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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| debasing | (adjective) used of conduct; characterized by dishonor | Synonyms: degrading |
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| debatable | (adjective) capable of being disproved | Synonyms: disputable |
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| (adjective) open to argument or debate | Synonyms: arguable, disputable, moot |
| (adjective) open to doubt or debate | Synonyms: problematic, problematical |
| debate | (noun) the formal presentation of a stated proposition and the opposition to it (usually followed by a vote) | Synonyms: disputation, public debate |
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| (noun) a discussion in which reasons are advanced for and against some proposition or proposal | Synonyms: argument, argumentation |
| (verb) argue with one another | - |
| (verb) discuss the pros and cons of an issue | Synonyms: deliberate |
| (verb) have an argument about something | Synonyms: argue, contend, fence |
| (verb) think about carefully; weigh | Synonyms: consider, deliberate, moot, turn over |
| debater | (noun) someone who engages in debate | Synonyms: arguer |
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| debauch | (noun) a wild gathering involving excessive drinking and promiscuity | Synonyms: bacchanal, bacchanalia, debauchery, drunken revelry, orgy, riot, saturnalia |
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| (verb) corrupt morally or by intemperance or sensuality | Synonyms: corrupt, debase, demoralise, demoralize, deprave, misdirect, pervert, profane, subvert, vitiate |
| debauched | (adjective) unrestrained by convention or morality | Synonyms: degenerate, degraded, dissipated, dissolute, fast, libertine, profligate, riotous |
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| debauchee | (noun) a dissolute person; usually a man who is morally unrestrained | Synonyms: libertine, rounder |
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| debaucher | (noun) someone who assaults others sexually | Synonyms: ravisher, violator |
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| debauchery | (noun) a wild gathering involving excessive drinking and promiscuity | Synonyms: bacchanal, bacchanalia, debauch, drunken revelry, orgy, riot, saturnalia |
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| debenture | (noun) a certificate or voucher acknowledging a debt | - |
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| (noun) the ability of a customer to obtain goods or services before payment, based on the trust that payment will be made in the future | Synonyms: debenture bond, unsecured bond |
| debile | (adjective) lacking bodily or muscular strength or vitality | Synonyms: decrepit, feeble, infirm, rickety, sapless, weak, weakly |
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| debilitate | (verb) make weak | Synonyms: drain, enfeeble |
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| debilitated | (adjective) lacking energy or vitality | Synonyms: adynamic, asthenic, enervated |
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| debilitating | (adjective) impairing the strength and vitality | - |
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| debilitation | (noun) serious weakening and loss of energy | Synonyms: enervation, enfeeblement, exhaustion |
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| debilitative | (adjective) causing debilitation | Synonyms: enervating, enfeebling, weakening |
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| debility | (noun) the state of being weak in health or body (especially from old age) | Synonyms: feebleness, frailness, frailty, infirmity, valetudinarianism |
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| debit | (noun) an accounting entry acknowledging sums that are owing | Synonyms: debit entry |
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| (verb) enter as debit | - |
| 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 |
| debonaire | (adjective) having a cheerful, lively, and self-confident air | Synonyms: chipper, debonair, jaunty |
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| (adjective) having a sophisticated charm | Synonyms: debonair, debonnaire, suave |
| debone | (verb) remove the bones from | Synonyms: bone |
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| deboned | (adjective) having had the bones removed | Synonyms: boned |
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| debonnaire | (adjective) having a sophisticated charm | Synonyms: debonair, debonaire, suave |
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| debouch | (verb) pass out or emerge; especially of rivers | - |
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| (verb) march out (as from a defile) into open ground | Synonyms: march out |
| debridement | (noun) surgical removal of foreign material and dead tissue from a wound in order to prevent infection and promote healing | - |
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| debrief | (verb) put someone through a debriefing and make him report | - |
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| debriefing | (noun) report of a mission or task | - |
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| debris | (noun) the remains of something that has been destroyed or broken up | Synonyms: detritus, dust, junk, rubble |
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| debt | (noun) an obligation to pay or do something | - |
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| (noun) money or goods or services owed by one person to another | - |
| (noun) the state of owing something (especially money) | - |
| debtor | (noun) a person who owes a creditor; someone who has the obligation of paying a debt | Synonyms: debitor |
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| debug | (verb) locate and correct errors in a computer program code | - |
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| debugger | (noun) a program that helps in locating and correcting programming errors | - |
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| debunk | (verb) expose while ridiculing; especially of pretentious or false claims and ideas | Synonyms: expose |
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| debunking | (noun) the exposure of falseness or pretensions | Synonyms: repudiation |
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| debut | (noun) the act of beginning something new | Synonyms: entry, first appearance, introduction, launching, unveiling |
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| (noun) the presentation of a debutante in society | - |
| (verb) appear for the first time in public | - |
| (verb) make one's debut | - |
| (verb) present for the first time to the public | - |
| debutante | (noun) a young woman making her debut into society | Synonyms: deb |
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| dec | (noun) (astronomy) the angular distance of a celestial body north or to the south of the celestial equator; expressed in degrees; used with right ascension to specify positions on the celestial sphere | Synonyms: celestial latitude, declination |
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| decade | (noun) the cardinal number that is the sum of nine and one; the base of the decimal system | Synonyms: 10, ten, tenner, X |
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| (noun) a period of 10 years | Synonyms: decennary, decennium |
| decadence | (noun) the state of being degenerate in mental or moral qualities | Synonyms: decadency, degeneracy, degeneration |
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| decadency | (noun) the state of being degenerate in mental or moral qualities | Synonyms: decadence, degeneracy, degeneration |
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| decadent | (adjective) marked by excessive self-indulgence and moral decay | Synonyms: fin-de-siecle |
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| (adjective) luxuriously self-indulgent | - |
| (noun) a person who has fallen into a decadent state (morally or artistically) | - |
| decaf | (noun) coffee with the caffeine removed | Synonyms: decaffeinated coffee |
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| decaffeinate | (verb) remove caffeine from (coffee) | - |
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| decagon | (noun) a polygon with 10 sides and 10 angles | - |
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| decagram | (noun) 10 grams | Synonyms: dag, dekagram, dkg |
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| decahedron | (noun) any polyhedron having ten plane faces | - |
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| decal | (noun) either a design that is fixed to some surface or a paper bearing the design which is to be transferred to the surface | Synonyms: decalcomania |
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| decalcification | (noun) loss of calcium from bones or teeth | - |
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| decalcify | (verb) remove calcium or lime from | - |
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| (verb) lose calcium or calcium compounds | - |
| decalcomania | (noun) the art of transferring designs from specially prepared paper to a wood or glass or metal surface | - |
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| (noun) either a design that is fixed to some surface or a paper bearing the design which is to be transferred to the surface | Synonyms: decal |
| decalescence | (noun) phenomenon that occurs when a metal is being heated and there is a sudden slowing in the rate of temperature increase; slowing is caused by a change in the internal crystal structure of the metal | - |
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| decalescent | (adjective) absorbing heat without increase in temperature when heated beyond a certain point | - |
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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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| decalitre | (noun) a metric unit of volume or capacity equal to 10 liters | Synonyms: dal, decaliter, 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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| decametre | (noun) a metric unit of length equal to ten meters | Synonyms: dam, decameter, dekameter, dekametre, dkm |
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| decamp | (verb) leave suddenly | Synonyms: skip, vamoose |
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| (verb) run away; usually includes taking something or somebody along | Synonyms: abscond, absquatulate, bolt, go off, make off, run off |
| (verb) leave a camp | Synonyms: break camp |
| decampment | (noun) breaking camp | - |
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| (noun) the act of running away secretly (as to avoid arrest) | Synonyms: abscondment |
| decant | (verb) pour out gradually, so as to separate out sediment | Synonyms: pour, pour out |
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| decantation | (noun) the act of gently pouring off a clear liquor (as from its original bottle) without disturbing the lees | - |
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| decanter | (noun) a bottle with a stopper; for serving wine or water | Synonyms: carafe |
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| decapitate | (verb) cut the head of | Synonyms: behead, decollate |
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| decapitated | (adjective) having had the head cut off | Synonyms: beheaded |
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| decapitation | (noun) killing by cutting off the head | Synonyms: beheading |
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| (noun) execution by cutting off the victim's head | Synonyms: beheading |
| 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 | - |
| decarbonate | (verb) remove carbon dioxide from | - |
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| decarbonise | (verb) remove carbon from (an engine) | Synonyms: decarbonize, decarburise, decarburize, decoke |
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| decarbonize | (verb) remove carbon from (an engine) | Synonyms: decarbonise, decarburise, decarburize, decoke |
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| decarboxylase | (noun) any of the enzymes that hydrolize the carboxyl group | - |
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| decarboxylate | (verb) lose a carboxyl group | - |
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| (verb) remove a carboxyl group from (a chemical compound) | - |
| decarboxylation | (noun) the process of removing a carboxyl group from a chemical compound (usually replacing it with hydrogen) | - |
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| decarburise | (verb) remove carbon from (an engine) | Synonyms: decarbonise, decarbonize, decarburize, decoke |
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| decarburize | (verb) remove carbon from (an engine) | Synonyms: decarbonise, decarbonize, decarburise, decoke |
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| decasyllabic | (adjective) having or characterized by or consisting of ten syllables | - |
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| decasyllable | (noun) a verse line having ten syllables | - |
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| decathlon | (noun) an athletic contest consisting of ten different events | - |
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| decay | (noun) the organic phenomenon of rotting | Synonyms: decomposition |
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| (noun) a gradual decrease; as of stored charge or current | Synonyms: decline |
| (noun) the process of gradually becoming inferior | - |
| (noun) the spontaneous disintegration of a radioactive substance along with the emission of ionizing radiation | Synonyms: disintegration, radioactive decay |
| (noun) an inferior state resulting from the process of decaying | - |
| (verb) fall into decay or ruin | Synonyms: crumble, dilapidate |
| (verb) lose a stored charge, magnetic flux, or current | Synonyms: decompose, disintegrate |
| (verb) undergo decay or decomposition | - |
| decayable | (adjective) liable to decay or spoil or become putrid | Synonyms: putrefiable, putrescible, spoilable |
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| decayed | (adjective) damaged by decay; hence unsound and useless | Synonyms: rotted, rotten |
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| decease | (noun) the event of dying or departure from life | Synonyms: death, expiry |
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| (verb) pass from physical life and lose all bodily attributes and functions necessary to sustain life | Synonyms: buy the farm, cash in one's chips, choke, conk, croak, die, drop dead, exit, expire, give-up the ghost, go, kick the bucket, pass, pass away, perish, pop off, snuff it |
| deceased | (adjective) dead | Synonyms: asleep, at peace, at rest, departed, gone |
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| (noun) someone who is no longer alive | Synonyms: dead person, dead soul, deceased person, decedent, departed |