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quinine (n.)[quinine 词源字典]: alkaloid responsible for curative properties in the cinchona tree, 1821, from French quinine (1820), with chemical ending -ine (2) + Spanish quina "cinchona bark" (from which it is extracted), from Quechua (Peru) kina. Earlier in reduplicated form quinaquina (1727).[quinine etymology, quinine origin, 英语词源]
quinoa (n.): 1620s, from Spanish spelling of Quechua kinua.
quinque-: before vowels quinqu-, word-forming element meaning "five, having five," from Latin quinque "five," by assimilation from PIE *penkwe (see five).
quinquennial (adj.): late 15c., "lasting five years," from Latin quinquennis "of five years, celebrated every fifth year," from quinque- "five" (see quinque-) + ending from biennial, etc. Meaning "happening once every five years" attested from c. 1600. As a noun from 1895; earlier quinquennal (1610s).
quinsy (n.): "severe sore throat," late 14c., qwinaci, from Old French quinancie (Modern French esquinacie), from Late Latin cynanche, from Greek kynankhe "sore throat," also "dog collar," literally "dog-choking," from kyon (genitive kynos) "dog" (see canine) + ankhein "to strangle," cognate with Latin angere (see anger (v.)).
quint (n.): 1520s, "a tax of one-fifth," from Middle French quint, from Latin quintus "the fifth," ordinal to quinque "five" (see quinque-). Used in English of various groups of five since 17c. First attested 1935 as a shortening of quintuplet (American English; British English prefers quin); used originally of the Dionne quintuplets, born May 28, 1934, near Callander, Ontario, Canada.
quinta (n.): "country house, villa," 1754, from Spanish and Portuguese quinta, originally a farm and house let out for a rent of one-fifth of its produce, from Latin quintus "one fifth," related to quinque "five" (see quinque-).
quintain (n.): "target for tilting and jousting practice," c. 1400 (in Anglo-Latin from mid-13c.), from Old French quintaine or directly from Medieval Latin quintana; perhaps from Latin quintana "of the fifth" (see quinque-), which as a noun meant "the business part of a camp," on the supposition that this was where military exercises were done [OED].
quintal (n.): "a weight of a hundred pounds," c. 1400, from Old French quintal "hundredweight," and directly from Medieval Latin quintale, from Arabic quintar, from Late Greek kentenarion, from Latin centenarius "containing a hundred" (see centenary).
quintessence (n.): early 15c., in ancient and medieval philosophy, "pure essence, substance of which the heavenly bodies are composed," literally "fifth essence," from Middle French quinte essence (14c.), from Medieval Latin quinta essentia, from Latin quinta, fem. of quintus "fifth" (see quinque-) + essentia (see Parousia).

A loan-translation of Greek pempte ousia, the "ether" added by Aristotle to the four known elements (water, earth, fire, air) and said to permeate all things. Its extraction was one of the chief goals of alchemy. Sense of "purest essence" (of a situation, character, etc.) is first recorded 1580s.
quintessential (adj.): c. 1600, "purest, most refined," from quintessence (Medieval Latin quint essentia) + -al (1). Related: Quintessentially.
quintet (n.): 1811, "composition for five voices," from Italian quintetto, diminutive of quinto "fifth," from Latin quintus "the fifth," related to quinque "five" (see quinque-). Meaning "set of five singers or players" is from 1882.
quintile (n.): 1610s, originally in astrology, from Latin quintus "the fifth" (see quinque-) + -ile, from quartile. Use in statistics dates to 1951.
quintillion (n.): 1670s, from Latin quintus "the fifth" (see quinque-) + ending from million. Compare billion. In Great Britain, the fifth power of a million (1 followed by 30 zeroes); in U.S. the sixth power of a thousand (1 followed by 18 zeroes).
quintuple (adj.): 1560s, from French quintuple (15c.), from Late Latin quintuplex, from Latin quintus "fifth" (related to quinque "five;" see quinque-) on model of quadruple. Related: Quintuplicate.
quintuple (v.): 1630s, from quintuple (adj.) or from French quintupler (v.). Related: Quintupled; quintupling.
quintuplet (n.): 1873, "set of five things" (originally in music), from quintuple (adj.) with ending from triplet. In plural, "five children at one birth" it is recorded from 1889.
quinzane (n.): "group of fifteen," 1856, from French quinzaine (12c.), from quinze "fifteen," from Latin quindecim (see fifteen).
quip (n.): 1530s, variant of quippy in same sense (1510s), perhaps from Latin quippe "indeed, of course, as you see, naturally, obviously" (used sarcastically), from quid "what" (neuter of pronoun quis "who;" see who), and compare quibble (n.)) + emphatic particle -pe.
quip (v.): "make a quip," 1570s, from quip (n.). Related: Quipped; quipping.