delinquent (n.) Look up delinquent at Dictionary.com
late 15c., from Middle French délinquant, from present participle of délinquer (15c.), and directly from Latin delinquentum (nominative delinquens), present participle of delinquere "to fail; be wanting, fall short; offend," from de- "completely" (see de-) + linquere "to leave" (see relinquish). As an adjective, from c.1600.
deliquesce (v.) Look up deliquesce at Dictionary.com
1756, in chemistry, from Latin deliquescere "to melt away," from de- (see de-) + liquescere "to melt," from liquere "to be liquid" (see liquid (adj.)). General use dates from 1858.
deliquescent (adj.) Look up deliquescent at Dictionary.com
1791, in chemistry, from Latin deliquescentem (nominative deliquescens), present participle of deliquescere (see deliquesce). General use dates from 1866. Related: Deliquescence.
delirious (adj.) Look up delirious at Dictionary.com
1703, from stem of delirium + -ous. Figurative use attested from 1791. Related: Deliriously.
delirium (n.) Look up delirium at Dictionary.com
1590s, from Latin delirium "madness," from deliriare "be crazy, rave," literally "go off the furrow," a plowing metaphor, from phrase de lire, from de "off, away" (see de-) + lira "furrow, earth thrown up between two furrows," from PIE *leis- (1) "track, furrow" (see learn).
delirium tremens (n.) Look up delirium tremens at Dictionary.com
1813, medical Latin, literally "trembling delirium," introduced 1813 by British physician Thomas Sutton, for "that form of delirium which is rendered worse by bleeding, but improved by opium. By Rayer and subsequent writers it has been almost exclusively applied to delirium resulting from the abuse of alcohol" [Sydenham Society Lexicon of Medicine]. As synonyms, Farmer lists barrel-fever, gallon distemper, blue Johnnies, bottle ache, pink spiders, quart-mania snakes in the boots, triangles, uglies, etc.
deliver (v.) Look up deliver at Dictionary.com
c.1200, "save, rescue, set free, liberate," from Old French delivrer "to set free; remove; save, preserve; hand over (goods)," also used of childbirth, from Late Latin deliberare, from de- "away" (see de-) + Latin liberare "to free" (see liberal (adj.)).

Childbirth sense in English, "to bring (a woman) to childbirth," is from c.1300. Sense of "hand over, give, give up, yield" is c.1300. in English, which brings it in opposition to its root. Meaning "project, throw" is 1590s. Related: Delivered; delivering.
deliverable (adj.) Look up deliverable at Dictionary.com
1755, from deliver + -able.
deliverance (n.) Look up deliverance at Dictionary.com
c.1300, "action of setting free" in physical or spiritual senses, from Old French deliverance (12c.), from délivrer (see deliver). Formerly also with senses now restricted to delivery.
delivery (n.) Look up delivery at Dictionary.com
early 15c., "action of handing over to another," from Anglo-French delivrée, noun use of fem. past participle of Old French délivrer (see deliver). Childbirth sense is attested from 1570s. Of speech, from 1580s. Of a blow, throw of a ball, etc., from 1702.
dell (n.1) Look up dell at Dictionary.com
Old English dell "dell, hollow, dale" (perhaps lost and then borrowed in Middle English from cognate Middle Dutch/Middle Low German delle), from Proto-Germanic *daljo (cognates: German Delle "dent, depression," Gothic ib-dalja "slope of a mountain"); related to dale (q.v.).
dell (n.2) Look up dell at Dictionary.com
rogue's cant 16c.-17c. for "a young girl of the vagrant class," of uncertain origin.
A Dell is a yonge wenche, able for generation, and not yet knowen or broken by the vpright man. ... [W]hen they have beene lyen with all by the vpright man then they be Doxes, and no Dells. [Thomas Harman, "A Caveat or Warning for Common Cursitors," 1567]
Della Crusca Look up Della Crusca at Dictionary.com
1796, from Italian Accademia della Crusca, literally "Academy of the Chaff," "the name of an Academy established at Florence in 1582, mainly with the object of sifting and purifying the Italian language; whence its name, and its emblem, a sieve" [OED].
Della Robbia Look up Della Robbia at Dictionary.com
1787, from name of a family of 15c. Florentine painters and sculptors; used of wares made by Luca Della Robbia (1400-1482), or those like them.
delouse (v.) Look up delouse at Dictionary.com
1918, from de- + louse. First used in reference to World War I armies. Related: Deloused; delousing.
Delphi Look up Delphi at Dictionary.com
oracle town on slopes of Mount Parnassus, from Greek delphis "dolphin" (see dolphin). Supposedly Apollo assumed this form to found the shrine.
Delphic (adj.) Look up Delphic at Dictionary.com
1590s, from Latin Delphicus, from Greek Delphikos, from Delphi (see Delphi).
delt (n.) Look up delt at Dictionary.com
short for deltoid (q.v.).
delta (n.) Look up delta at Dictionary.com
c.1200, Greek letter shaped like a triangle, equivalent to our "D," the name from Phoenician daleth "tent door." Herodotus used it of the mouth of the Nile, and it was so used in English from 1550s; applied to other river mouths from 1790.
deltoid (adj.) Look up deltoid at Dictionary.com
1741, in deltoid muscle, so called for its shape, from Greek deltoeides "triangular," literally "shaped like the letter delta;" see delta + -oid.
delude (v.) Look up delude at Dictionary.com
c.1400, from Latin deludere "to play false; to mock, deceive," from de- "down, to one's detriment" (see de-) + ludere "to play" (see ludicrous). Related: Deluded; deluding.
deluge (n.) Look up deluge at Dictionary.com
late 14c., from Old French deluge (12c.), earlier deluve, from Latin diluvium "flood, inundation," from diluere "wash away," from dis- "away" (see dis-) + -luere, comb. form of lavere "to wash" (see lave).
deluge (v.) Look up deluge at Dictionary.com
1590s; see deluge (n.). Related: Deluged; deluging.
delusion (n.) Look up delusion at Dictionary.com
"act of misleading someone," early 15c.; as a form of mental derangement, 1550s, from Latin delusionem (nominative delusio) "a deceiving," noun of action from past participle stem of deludere (see delude).

Technically, delusion is a belief that, though false, has been surrendered to and accepted by the whole mind as a truth; illusion is an impression that, though false, is entertained provisionally on the recommendation of the senses or the imagination, but awaits full acceptance and may not influence action. Delusions of grandeur, the exact phrase, is recorded from 1840, though the two words were in close association for some time before that.
delusional (adj.) Look up delusional at Dictionary.com
1871, from delusion + -al (1).
delusive (adj.) Look up delusive at Dictionary.com
c.1600; see delusion + -ive.
deluxe (adj.) Look up deluxe at Dictionary.com
1819, from French de luxe, literally "of luxury," from Latin luxus "excess, abundance" (see luxury).
delve (v.) Look up delve at Dictionary.com
Old English delfan "to dig" (class III strong verb; past tense dealf, past participle dolfen), common West Germanic verb (cognates: Old Saxon delban, Dutch delven, Middle High German telben "to dig"), from PIE root *dhelbh- (cognates: Lithuanian delba "crowbar," Russian dolbit', Czech dlabati, Polish dłubać "to chisel;" Russian dolotó, Czech dlato, Polish dłuto "chisel"). Weak inflections emerged 14c.-16c. Related: Delved; delving.
dem Look up dem at Dictionary.com
representing pronunciation of them in Jamaican speech, from 1868. As a minced form of damn, attested from late 14c.
demagnetize (v.) Look up demagnetize at Dictionary.com
1839; see de- + magnetize. Related: Demagnetized; demagnetizing.
demagogic (adj.) Look up demagogic at Dictionary.com
1831; see demagogue + -ic. Greek had demagogikos "fit for or like a demagogue."
demagogue (n.) Look up demagogue at Dictionary.com
1640s, from Greek demagogos "popular leader," also "leader of the mob," from demos "people" (see demotic) + agogos "leader," from agein "to lead" (see act (n.)). Often a term of disparagement since the time of its first use, in Athens, 5c. B.C.E. Form perhaps influenced by French demagogue (mid-14c.).
demagogue (v.) Look up demagogue at Dictionary.com
by 1964, American English, from demagogue (n.). Related: Demagogued; demagoguing.
demagoguery (n.) Look up demagoguery at Dictionary.com
1855; see demagogue + -ery. Demagogy in the same sense is from 1650s, from Greek demagogia "leadership of the people."
demand (v.) Look up demand at Dictionary.com
late 14c., "ask, make inquiry," from Old French demander (12c.) "to request; to demand," from Latin demandare "entrust, charge with a commission" (in Vulgar Latin, "to ask, request, demand"), from de- "completely" (see de-) + mandare "to order" (see mandate). Meaning "to ask for as a right" is early 15c., from Anglo-French legal use. Related: Demanded; demanding.
demand (n.) Look up demand at Dictionary.com
late 13c., "a question," from Old French demande (see demand (v.)). Meaning "a request, claim" is from c.1300. In the political economy sense (correlating to supply) it is attested from 1776 in Adam Smith.
demanding (adj.) Look up demanding at Dictionary.com
early 15c., "asking, questioning," present participle adjective from demand (v.). Meaning "insistent" is by late 19c. Related: Demandingly.
demarcate (v.) Look up demarcate at Dictionary.com
1816, back-formation from demarcation. Related: Demarcated; demarcating.
demarcation (n.) Look up demarcation at Dictionary.com
c.1752, from Spanish linea de demarcacion or Portuguese linha de demarcaçao, name of the line laid down by Pope Alexander VI, May 4, 1493, dividing the New World between Spain and Portugal on a line 100 leagues west of the Cape Verde Islands. Applied from 1801 to other lines dividing regions. From Spanish de- (see de-) + marcar "to mark the boundaries of," from a Germanic source (see mark (n.1)).
demarche (n.) Look up demarche at Dictionary.com
1650s, "walk, step," from French démarche (15c.) literally "gait, walk, bearing," from démarcher (12c.) "to march," from de- (see de-) + marcher (see march (v.)). Meaning "a diplomatic step" attested from 1670s. A word never quite anglicized.
demark (v.) Look up demark at Dictionary.com
1650s, abstracted from demarcation and altered by influence of mark (v.).
dematerialize (v.) Look up dematerialize at Dictionary.com
1884; see de- + materialize. Related: Dematerialized; dematerializing.
demean (v.) Look up demean at Dictionary.com
"lower in dignity," c.1600, perhaps from de- "down" + mean (adj.) and modeled on debase. Indistinguishable in some uses from obsolete demean (see demeanor) which influenced it and may be its true source. Related: Demeaned; demeaning.
demeaning (adj.) Look up demeaning at Dictionary.com
1829, present participle adjective from demean (v.). Related: Demeaningly.
demeanor (n.) Look up demeanor at Dictionary.com
late 15c., from obsolete Middle English demean "handle, manage, conduct," later "behave in a certain way" (early 14c.), from Old French demener (11c.) "to guide, conduct; to live, dwell," from de- "completely" (see de-) + mener "to lead, direct," from Latin minare "to threaten," in Late Latin "to drive (a herd of animals);" see menace. Sense in English evolved from notion of "conduct, manage" (oneself). Spelling changed by influence of nouns in -or, -our.
demeanour Look up demeanour at Dictionary.com
chiefly British English spelling of demeanor; for suffix, see -or.
dement (v.) Look up dement at Dictionary.com
"to drive mad," 1540s, probably from Middle French démenter, from Late Latin dementare "to drive out of one's mind," from stem of Latin demens "out of one's senses, insane, raving, foolish; distracting, wild, reckless" (a less technical term than insanitas), from phrase de mente, from de + mente, ablative of mens mind" (see mind (n.)).
demented (adj.) Look up demented at Dictionary.com
1640s, from obsolete dement "drive mad."
dementia (n.) Look up dementia at Dictionary.com
1806, from Latin dementia "madness, insanity," literally "a being out of one's mind," from dement-, stem of demens "mad, raving" (see dement) + abstract noun suffix -ia. It existed earlier in an anglicized form, demency (1520s), from French démence. Dementia praecox is a Modern Latin form recorded from 1899 in English, 1891 in German, from French démence précoce (1857). See precocious.
demerit (n.) Look up demerit at Dictionary.com
late 14c., from Old French desmerite "blame, demerit" (Modern French démérite), from des- "not, opposite" (see dis-) + merite "merit" (see merit (n.)). Latin demereri meant "to merit, deserve," from de- in its completive sense. But Medieval Latin demeritum meant "fault." Both senses existed in the Middle French form of the word. Meaning "penalty point in school" is attested from 1862.