英语词源字典 - 在线词源网站

dunno (v.)[dunno 词源字典]: colloquial for "(I) don't know," first attested 1842 in American English.[dunno etymology, dunno origin, 英语词源]
duo (n.): 1580s, "song for two voices," via either Italian or French, from Latin duo "two" (see two). Meaning "two people" (especially as an entertainment team) attested by 1887.
duodecimal (adj.): 1714, from Latin in duodecimo (see duodecimo).
duodecimo: 1650s, from Latin in duodecimo (folded) "in a twelfth" of a sheet, from ablative of duodecimus "twelfth," from duodecim (see dozen). Often abbreviated 12mo.; a book in which each page is the twelfth part of the printer's sheet.
duodenal (adj.): 1817; see duodenum + -al (1).
duodenum (n.): late 14c., from Medieval Latin duodenum digitorium "space of twelve digits," from Latin duodeni "twelve each." Coined by Gerard of Cremona (d.1187), who translated "Canon Avicennae," a loan-translation of Greek dodekadaktylon, literally "twelve fingers long," the intestine part so called by Greek physician Herophilus (c. 353-280 B.C.E.) for its length, about equal to the breadth of twelve fingers.
dupe (n.): 1680s, from French dupe "deceived person," from Middle French duppe (early 15c.), thieves' jargon, perhaps from phrase de huppe "of the hoopoe," an extravagantly crested and reputedly stupid bird.
dupe (v.): 1704, from dupe (n.). Related: Duped; duping.
duplex (adj.): 1817, "composed of two parts," from Latin duplex, from duo "two" (see two) + -plex, from Greek plax (genitive plakos) "flat surface." The noun sense of "house for two families; two-story apartment" is American English, 1922.
duplicate (adj.): mid-15c., "having two parts, double," from Latin duplicatus, past participle of duplicare "to double," from duo "two" (see two) + plicare "to fold" see ply (v.1)). Meaning "exactly corresponding, that is an exact copy of" is from 1812.
duplicate (v.): 1620s, "to double," from Latin duplicatus, past participle of duplicare (see duplicate (adj.)). Meaning "make an exact copy" is from 1640s (implied in duplicated). Related: Duplicating. The noun is first recorded 1530s.
duplication (n.): early 15c., "doubling," from Middle French duplicacion (13c.) and directly from Latin duplicationem (nominative duplicatio), noun of action from past participle stem of duplicare (see duplicate (adj.)). Meaning "repetition" is from 1580s.
duplicative (adj.): 1870; see duplicate (v.) + -ive.
duplicitous (adj.): 1831; see duplicity + -ous.
duplicity (n.): early 15c., from Old French duplicite (13c.), from Late Latin duplicitatem (nominative duplicitas) "doubleness," in Medieval Latin "ambiguity," noun of quality from duplex (genitive duplicis) "twofold." The notion is of being "double" in one's conduct (compare Greek diploos "treacherous, double-minded," literally "twofold, double").
dura mater (n.): "tough outer membrane surrounding the brain," c. 1400, from Medieval Latin dura mater cerebri, literally "hard mother of the brain," a loan-translation of Arabic umm al-dimagh as-safiqa, literally "thick mother of the brain." "In Arabic, the words 'father,' 'mother,' and 'son' are often used to denote relationships between things" [Klein].
durability (n.): late 14c., from Old French durabilité, from Late Latin durabilitatem (nominative durabilitas), noun of quality from Latin durabilis (see durable).
durable (adj.): late 14c., from Old French durable (11c.), from Latin durabilis "lasting, permanent," from durare "to last, harden" (see endure). Durable goods attested from 1930.
durance (n.): late 15c., from Old French durance "duration," from durer "to endure," from Latin durare (see endure).
duration (n.): late 14c., from Old French duration, from Medieval Latin durationem (nominative duratio), noun of action from past participle stem of Latin durare "harden" (see endure). Old legalese phrase for the duration popularized 1916 in reference to British enlistments in World War I.