| decoy | (noun) something used to lure fish or other animals into danger so they can be trapped or killed | Synonyms: bait, lure |
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| (noun) a beguiler who leads someone into danger (usually as part of a plot) | Synonyms: steerer |
| (verb) lure or entrap with or as if with a decoy | - |
| decrease | (noun) the act of decreasing or reducing something | Synonyms: diminution, reduction, step-down |
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| (noun) the amount by which something decreases | Synonyms: decrement |
| (noun) a change downward | Synonyms: drop-off, lessening |
| (noun) a process of becoming smaller or shorter | Synonyms: decrement |
| (verb) decrease in size, extent, or range | Synonyms: diminish, fall, lessen |
| (verb) make become smaller | Synonyms: lessen, minify |
| decreased | (adjective) made less in size or amount or degree | Synonyms: reduced |
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| decreasing | (adjective) becoming less or smaller | - |
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| (adjective) (music) decreasing in tempo and/or volume | - |
| decree | (noun) a legally binding command or decision entered on the court record (as if issued by a court or judge) | Synonyms: edict, fiat, order, rescript |
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| (verb) decide with authority | Synonyms: rule |
| (verb) issue a decree | - |
| decreed | (adjective) fixed or established especially by order or command | Synonyms: appointed, ordained, prescribed |
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| decrement | (noun) the amount by which something decreases | Synonyms: decrease |
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| (noun) a process of becoming smaller or shorter | Synonyms: decrease |
| decrementation | (noun) the operation of subtracting one from the operand. | - |
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| decrepit | (adjective) lacking bodily or muscular strength or vitality | Synonyms: debile, feeble, infirm, rickety, sapless, weak, weakly |
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| (adjective) worn and broken down by hard use | Synonyms: creaky, derelict, flea-bitten, run-down, woebegone |
| decrepitate | (verb) to roast or calcine so as to cause to crackle or until crackling stops | - |
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| (verb) undergo decrepitation and crackle | - |
| decrepitation | (noun) the crackling or breaking up of certain crystals when they are heated | - |
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| decrepitude | (noun) a state of deterioration due to old age or long use | Synonyms: dilapidation |
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| (noun) The quality or state of being wasted and weakened by or as if by the infirmities of old age. | - |
| decrescendo | (adjective) (music) gradually decreasing in volume | Synonyms: diminuendo |
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| (noun) (music) a gradual decrease in loudness | Synonyms: diminuendo |
| (verb) grow quieter | - |
| decriminalisation | (noun) legislation that makes something legal that was formerly illegal | Synonyms: decriminalization |
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| decriminalise | (verb) make legal | Synonyms: decriminalize, legalise, legalize, legitimate, legitimatise, legitimatize, legitimise, legitimize |
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| decriminalization | (noun) legislation that makes something legal that was formerly illegal | Synonyms: decriminalisation |
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| decriminalize | (verb) make legal | Synonyms: decriminalise, legalise, legalize, legitimate, legitimatise, legitimatize, legitimise, legitimize |
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| decry | (verb) express strong disapproval of | Synonyms: condemn, excoriate, objurgate, reprobate |
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| decrypt | (verb) convert code into ordinary language | Synonyms: decipher, decode |
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| decryption | (noun) the activity of making clear or converting from code into plain text | Synonyms: decipherment, decoding |
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| decubitus | (noun) a reclining position (as in a bed) | - |
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| decumary | (noun) woody climber of southeastern United States having white flowers in compound terminal clusters | Synonyms: Decumaria barbara, Decumaria barbata |
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| decumbent | (adjective) lying down; in a position of comfort or rest | Synonyms: accumbent, recumbent |
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| decurved | (adjective) bent down or curved downward | - |
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| decussate | (adjective) crossed or intersected in the form of an X | Synonyms: intersectant, intersecting |
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| (verb) cross or intersect so as to form a cross | - |
| decussation | (noun) an intersection or crossing of two tracts in the form of the letter X | Synonyms: chiasm, chiasma |
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| dodecagon | (noun) a twelve-sided polygon | - |
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| dodecahedron | (noun) any polyhedron having twelve plane faces | - |
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| duodecimal | (adjective) based on twelve | - |
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| (noun) one part in twelve equal parts | Synonyms: one-twelfth, twelfth, twelfth part |
| foredeck | (noun) the deck between the bridge and the forecastle | - |
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| haemorrhoidectomy | (noun) surgical procedure for tying hemorrhoids and excising them | Synonyms: hemorrhoidectomy |
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| hemorrhoidectomy | (noun) surgical procedure for tying hemorrhoids and excising them | Synonyms: haemorrhoidectomy |
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| hexadecimal | (adjective) of or pertaining to a number system having 16 as its base | Synonyms: hex |
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| indecency | (noun) an indecent or improper act | Synonyms: impropriety |
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| (noun) the quality of being indecent | - |
| indecent | (adjective) offensive to good taste especially in sexual matters | - |
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| (adjective) offending against sexual mores in conduct or appearance | - |
| (adjective) not in keeping with accepted standards of what is right or proper in polite society | Synonyms: indecorous, unbecoming, uncomely, unseemly, untoward |
| indecently | (adverb) in an indecent manner | - |
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| indecipherable | (adjective) not easily deciphered | Synonyms: unclear, undecipherable, unreadable |
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| (adjective) impossible to determine the meaning of | - |
| indecision | (noun) the trait of irresolution; a lack of firmness of character or purpose | Synonyms: indecisiveness |
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| (noun) doubt concerning two or more possible alternatives or courses of action | Synonyms: indecisiveness, irresolution |
| indecisive | (adjective) not definitely settling something | - |
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| (adjective) characterized by lack of decision and firmness | - |
| (adjective) not clearly defined | - |
| indecisively | (adverb) without finality; inconclusively | - |
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| (adverb) lacking firmness or resoluteness | - |
| indecisiveness | (noun) the trait of irresolution; a lack of firmness of character or purpose | Synonyms: indecision |
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| (noun) doubt concerning two or more possible alternatives or courses of action | Synonyms: indecision, irresolution |
| indecorous | (adjective) lacking propriety and good taste in manners and conduct | Synonyms: indelicate |
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| (adjective) not in keeping with accepted standards of what is right or proper in polite society | Synonyms: indecent, unbecoming, uncomely, unseemly, untoward |
| indecorously | (adverb) without decorousness | Synonyms: unbecomingly |
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| indecorousness | (noun) a lack of decorum | Synonyms: indecorum |
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| indecorum | (noun) an act of undue intimacy | Synonyms: familiarity, impropriety, liberty |
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| (noun) a lack of decorum | Synonyms: indecorousness |
| iridectomy | (noun) an eye operation that treats closed-angle glaucoma by surgical removal of part of the iris of the eye | - |
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| mastoidectomy | (noun) surgical removal of some or all of the mastoid process | - |
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| orchidectomy | (noun) surgical removal of one or both testicles | Synonyms: orchiectomy |
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| predecease | (verb) die before; die earlier than | - |
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| predecessor | (noun) something that precedes and indicates the approach of something or someone | Synonyms: forerunner, harbinger, herald, precursor |
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| (noun) one who precedes you in time (as in holding a position or office) | - |
| quarterdeck | (noun) the stern area of a ship's upper deck | - |
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| redecorate | (verb) redo the decoration of an apartment or house | - |
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| rhytidectomy | (noun) plastic surgery to remove wrinkles and other signs of aging from your face; an incision is made near the hair line and skin is pulled back and excess tissue is excised | Synonyms: cosmetic surgery, face lift, face lifting, facelift, lift, nip and tuck, rhytidoplasty |
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| sidecar | (noun) conveyance consisting of a small carrier attached to the side of a motorcycle | - |
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| (noun) a cocktail made of orange liqueur with lemon juice and brandy | - |
| sigmoidectomy | (noun) surgical removal of part or all of the sigmoid colon (usually to remove a malignant tumor) | - |
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| stapedectomy | (noun) surgical removal of the stapes of the middle ear | - |
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| thyroidectomy | (noun) surgical removal of the thyroid gland | - |
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| tradecraft | (noun) skill acquired through experience in a trade; often used to discuss skill in espionage | - |
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| undecagon | (noun) an eleven-sided polygon | - |
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| undeceive | (verb) free from deception or illusion | - |
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| undeceived | (adjective) freed of a mistaken or misguided notion | Synonyms: disabused |
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| undecideable | (adjective) not capable of being decided as following or not following from the axioms of a logical system | - |
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| undecided | (adjective) characterized by indecision | Synonyms: on the fence |
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| (adjective) not yet having made a commitment | - |
| (adjective) not brought to a conclusion; subject to further thought | Synonyms: open, undetermined, unresolved |
| undecipherable | (adjective) not easily deciphered | Synonyms: indecipherable, unclear, unreadable |
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| undecipherably | (adverb) in an illegible manner | Synonyms: illegibly, unreadably |
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| undeciphered | (adjective) not deciphered | - |
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| undeclared | (adjective) not announced or openly acknowledged | - |
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| undecomposable | (adjective) representing the furthest possible extent of analysis or division into parts | Synonyms: unanalyzable |
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| undecomposed | (adjective) not decayed | Synonyms: incorrupt |
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| undecorated | (adjective) not decorated with something to increase its beauty or distinction | Synonyms: unadorned |
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| valdecoxib | (noun) a Cox-2 inhibitor (trade name Bextra) that relieves pain and inflammation without harming the digestive tract | Synonyms: Bextra |
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| zydeco | (noun) music of southern Louisiana that combines French dance melodies with Caribbean music and blues | - |
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