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ducat [ducat 词源字典]: ducat: see duke
[ducat etymology, ducat origin, 英语词源]
duchess: duchess: see duke
duchy: duchy: see duke
duck: duck: [OE] A duck is a bird that ‘ducks’ – as simple as that. It gets its name from its habit of diving down under the surface of the water. There is no actual record of an English verb duck until the 14th century, but it is generally assumed that an Old English verb *dūcan did exist, which would have formed the basis of the noun duck. It came from a prehistoric West Germanic verb *dukjan, which also produced German tauchen ‘dive’.

English is the only language which uses this word for the bird, although Swedish has the term dykand, literally ‘dive-duck’, which refers to the ‘diver’, a sort of large waterbird. Nor is it the original English word: the Anglo-Saxons mainly called the duck ened, a term which survived until the 15th century. This represents the main Indo-European name for the duck, which comes from an original *anə ti- and is found in Greek nessa, Latin anas, German ente, Dutch eend, Swedish and, and Russian utka.
duct: duct: [17] Duct comes from Latin ductus, a noun formed from the past participle of the verb dūcere ‘lead’. This is among the most prolific Latin sources of English words. It appears in numerous prefixed forms, all containing to some extent the underlying meaning element ‘lead’, such as deduce, introduce, produce, and reduce, as well as educate and, in less obvious form, subdue.

Its past participle produced aqueduct and ductile [14], not to mention (via Vulgar Latin *ductiāre and Italian docciare) douche [18]. And furthermore it comes ultimately from the same Indo-European source as produced English team, teem, tie, tight, tow, and tug.
=> aqueduct, conduct, deduce, deduct, douche, duke, educate, introduce, produce, reduce, seduce, team, tie, tight, tow, tug
educate: educate: [15] To educate people is literally to ‘lead them out’. The word comes from the past participle of Latin ēducāre, which meant ‘bring up, rear’ as well as more specifically ‘educate’. It was related to ēdūcere ‘lead out’ (source of English educe [15]), a compound verb formed from the prefix ex- ‘out’ and dūcere ‘lead’ (source of English duct, duke, and a whole host of derivatives such as deduce and seduce).
=> conduct, deduce, duct, duke, educe, produce, seduce
fiduciary: fiduciary: see faith
introduce: introduce: [16] Introduce means etymologically ‘lead inside’. It was borrowed from Latin intrōdūcere ‘lead in’, a compound verb formed from the prefix intrō- ‘in, inside’ and dūcere ‘lead’ (source of English duct, duke, educate, produce, etc). Of its main secondary meanings, ‘use for the first time, originate’ emerged in Latin but ‘make known personally to others’ seems to have been a later development.
=> duct, duke, educate, produce
produce: produce: [15] To produce something is etymologically to ‘lead it forward’, a meaning still discernible beneath the veil of metaphor that clothes the modern English word’s range of meanings. It comes from Latin prōdūcere, a compound verb formed from the prefix prō- ‘forward’ and dūcere ‘lead’ (source of English duct, duke, educate, introduce, etc).
=> duct, duke, educate, induce, introduce
reduce: reduce: [14] ‘Lessen, diminish’ is a comparatively recent semantic development for reduce. Its Latin ancestor was certainly not used in that sense. This was redūcere, a compound verb formed from the prefix re- ‘back, again’ and dūcere ‘lead, bring’ (source of English duct, duke, educate, etc). It meant literally ‘bring back’, hence ‘restore’ and also ‘withdraw’.

The original ‘bring back’ made the journey to English, and even survived into the early 17th century (‘reducing often to my memory the conceit of that Roman stoic’, Sir Henry Wotton, Elements of Architecture 1624). The sense ‘lessen, diminish’ seems to be the result of a semantic progression from ‘bring back to a particular condition’ via ‘bring back to order’ and ‘bring to subjection’.
=> duct, duke, educate, introduce, produce, redoubt
abduce (v.): "to draw away" by persuasion, 1530s, from Latin abductus, past participle of abducere "to lead away" (see abduction). Related: Abduced; abducing.
abducent (adj.): 1713, from Latin abducentem (nominative abducens), present participle of abducere "to lead away" (see abduction).
abduct (v.): "to kidnap," 1834, probably a back-formation from abduction; also see abduce. Related: Abducted; abducting.
abduction (n.): 1620s, "a leading away," from Latin abductionem (nominative abductio), noun of action from past participle stem of abducere "to lead away, take away" (often by force), from ab- "away" (see ab-) + ducere "to lead" (see duke (n.)). The illegal activity so called from 1768; before that the word also was a term in surgery and logic. In the Mercian hymns, Latin abductione is glossed by Old English wiðlaednisse.
adduce (v.): early 15c., from Latin adducere "lead to, bring to, bring along," from ad- "to" (see ad-) + ducere "to lead" (see duke (n.)). Related: Adduced; adducing.
aqueduct (n.): 1530s, from Latin aquaeductus "conveyance of water," from aquae, genitive of aqua "water" (see aqua-), + ductus "a leading, conducting," past participle of ducere "to lead" (see duke (n.)).
archduchess (n.): 1610s; see arch- + duchess. Also compare archduke.
by-product (n.): also byproduct; 1857, from by + product.
caduceus (n.): 1590s, from Latin caduceus, alteration of Doric Greek karykeion "herald's staff," from karyx (genitive karykos) "a herald," from PIE *karu-, from root *kar- "to praise loudly, extol" (cognates: Sanskrit carkarti "mentions with praise," Old English hreð "fame, glory"). Token of a peaceful embassy; originally an olive branch. Especially the wand carried by Mercury, messenger of the gods, usually represented with two serpents twined round it.
circumduction (n.): 1570s, from Latin circumductionem (nominative circumductio), noun of action from past participle stem of circumducere "to lead around, move or drive around," from circum "around" (see circum-) + ducere "to lead" (see duke (n.)). Related: Circumduce.
coeducational (adj.): also co-educational, 1881, from co-education (1852), from co- + education.
conduce (v.): c. 1400, from Latin conducere "to lead or bring together, contribute, serve," from com- "together" (see com-) + ducere "to lead" (see duke (n.)).
conducive (adj.): 1640s, from conduce + -ive.
conduct (v.): early 15c., "to guide," from Latin conductus, past participle of conducere "to lead or bring together" (see conduce). Sense of "convey" is from early 15c.; that of "to direct, manage" is from 1630s; "to behave in a certain way" from c. 1710; "to convey" from 1740. Related: Conducted; conducting. Earlier verb in the same sense was condyten (c. 1400), related to conduit. The noun is from mid-15c., "guide" (in sauf conducte); sense of "behavior" is first recorded 1670s.
conduction (n.): 1530s, "hiring;" 1540s, "leading, guidance," from Old French conduction "hire, renting," from Latin conductionem (nominative conductio), noun of action from past participle stem of conducere (see conduce). Sense of "conducting of a liquid through a channel" is from 1610s; in physics, of heat, etc., from 1814.
conductive (adj.): 1520s, from conduct + -ive. Physics sense is from 1840. Related: Conductivity (1837).
conductor (n.): 1520s, "one who leads or guides," from Middle French conductour (14c., Old French conduitor), from Latin conductor "one who hires, contractor," in Late Latin "a carrier," from conductus, past participle of conducere (see conduce).

Earlier in same sense was conduitour (early 15c., from Old French conduitor). Meaning "leader of an orchestra or chorus" is from 1784; meaning "one who has charge of passengers and collects fares on a railroad" is 1832, American English. Physics sense of "object or device that passes heat" is from 1745; of electricity from 1737.
counterproductive (adj.): also counter-productive, counter productive, 1920, American English, from counter- + productive.
deduce (v.): early 15c., from Latin deducere "lead down, derive" (in Medieval Latin, "infer logically"), from de- "down" (see de-) + ducere "to lead" (see duke (n.)). Originally literal; sense of "draw a conclusion from something already known" is first recorded 1520s, from Medieval Latin. Related: Deduced; deducing.
deduct (v.): early 15c., from Latin deductus, past participle of deducere "lead down, bring away;" see deduce, with which it formerly was interchangeable. Technically, deduct refers to taking away portions or amounts; subtract to taking away numbers. Related: Deducted; deducting.
deductible (adj.): 1610s, "that may be deduced," also "that may be deducted;" from Latin deducere (see deduce) + -ible. As a noun, "deductible thing," by 1927.
deduction (n.): early 15c., "action of deducting," from Middle French déduction or directly from Latin deductionem (nominative deductio), noun of action from past participle stem of deducere (see deduce). Meaning "that which is deducted" is from 1540s. As a term in logic, from Late Latin use of deductio as a loan-translation of Greek apagoge.
deductive (adj.): 1640s, from Latin deductivus, from deduct-, past participle stem of deducere "to deduce" (see deduce). Related: Deductively.
ducal (adj.): late 15c., from Middle French ducal (15c.), from Late Latin ducalis, from Latin dux (genitive ducis); see duke (n.).
ducat (n.): late 14c., from Old French ducat (late 14c.), from Italian ducato (12c.), from Medieval Latin ducatus "coin," originally "duchy," from dux (genitive ducis) "duke" (see duke (n.)).

So called for the name or effigy of Roger II of Sicily, Duke of Apulia, which first issued the coins (c.1140). Byzantine emperor Constantine X had the Greek form doux struck on his coins during his reign (1059-1067). Over the years it was a unit of currency of varying value in Holland, Russia, Austria, Sweden, Venice, etc. Remained popular in slang for "money" or "ticket" from its prominence in "The Merchant of Venice."
Duce (n.): 1923, title assumed by Benito Mussolini (1883-1945); Italian, literally "leader," from Latin ducem (see duke (n.)).
duchess (n.): c. 1300, from Old French duchesse, from Late Latin or Medieval Latin ducissa, fem. of dux (see duke (n.)). Often spelled dutchess until early 19c. (as in Dutchess County, New York, U.S.).
duchy (n.): mid-14c., "territory ruled by a duke or duchess," from Old French duché (12c.), from Medieval Latin ducatus, from Latin dux (see duke (n.)).
duck (n.1): waterfowl, Old English duce (found only in genitive ducan) "a duck," literally "a ducker," presumed to be from Old English *ducan "to duck, dive" (see duck (v.)). Replaced Old English ened as the name for the bird, this being from PIE *aneti-, the root of the "duck" noun in most Indo-European languages.
In the domestic state the females greatly exceed in number, hence duck serves at once as the name of the female and of the race, drake being a specific term of sex. [OED]
As a term of endearment, attested from 1580s. duck-walk is 1930s; duck soup "anything easily done" is by 1899. Duck's ass haircut is from 1951. Ducks-and-drakes, skipping flat stones on water, is from 1580s; the figurative sense of "throwing something away recklessly" is c. 1600.
duck (n.2): "strong, untwilled linen (later cotton) fabric," used for sails and sailors' clothing, 1630s, from Dutch doeck "linen cloth" (Middle Dutch doec), related to German Tuch "piece of cloth," Danish dug, Old Frisian dok, Old High German tuoh, all of unknown origin.
duck (v.): "to plunge into" (transitive), c. 1300; to suddenly go under water (intransitive), mid-14c., from presumed Old English *ducan "to duck," found only in derivative duce (n.) "duck" (but there are cognate words in other Germanic languages, such as Old High German tuhhan "to dip," German tauchen "to dive," Old Frisian duka, Middle Dutch duken "to dip, dive," Dutch duiken), from Proto-Germanic *dukjan.

Sense of "bend, stoop quickly" is first recorded in English 1520s. Related: Ducked; ducking. The noun is attested from 1550s in the sense of "quick stoop;" meaning "a plunge, dip" is from 1843.
duckling (n.): mid-15c., dookelynge, from duck (n.) + -ling. The ugly duckling is from Hans Christian Andersen's tale (1843 in Danish, by 1846 in English).
ducky (adj.): "excellent," slang from 1897 (often ironical),perhaps from duckie as a term of endearment (early 19c.). Probably not related to much earlier slang noun meaning "a woman's breast" ["...whose pritty duckys I trust shortly to kysse," Henry VIII, c. 1536 letter to Anne Boleyn, who, contrary to rumor, did not have three of them].
duct (n.): 1640s, "course, direction," from Latin ductus "a leading," past participle of ducere "to lead" (see duke (n.)). Anatomical sense is from 1660s. Meaning "conduit, channel" is 1713; that of "air tube in a structure" is from 1884.
duct tape: by 1943; see duct (here in the electrical wiring sense) + tape.
ductile (adj.): mid-14c., from Old French ductile or directly from Latin ductilis "that may be led or drawn," from past participle of ducere "to lead" (see duke (n.)). Related: Ductility.
educability (n.): 1821, in phrenology; see educable + -ity.
educable (adj.): 1836, "fit to be educated," 1836, from French éducable; see educate + -able.
educate (v.): mid-15c., "bring up (children), to train," from Latin educatus, past participle of educare "bring up, rear, educate" (source also of Italian educare, Spanish educar, French éduquer), which is a frequentative of or otherwise related to educere "bring out, lead forth," from ex- "out" (see ex-) + ducere "to lead" (see duke (n.)). Meaning "provide schooling" is first attested 1580s. Related: Educated; educating.

According to "Century Dictionary," educere, of a child, is "usually with reference to bodily nurture or support, while educare refers more frequently to the mind," and, "There is no authority for the common statement that the primary sense of education is to 'draw out or unfold the powers of the mind.'"
educated (adj.): 1660s, past participle adjective from educate (v.). As an abbreviated way to say well-educated, attested from 1855. Educated guess first attested 1954.