kerfuffle (n.)youdaoicibaDictYouDict[kerfuffle 词源字典]
"row, disturbance," 1973, said to have been used c. 1930 in Canadian English, ultimately from Scottish curfuffle.[kerfuffle etymology, kerfuffle origin, 英语词源]
kermes (n.)youdaoicibaDictYouDict
"shield louse," c. 1600 of the insect preparation used as a dye, etc.; 1590s of the species of oak on which the insects live, from Medieval Latin cremesinus (also source of French kermès, Italian chermes, Spanish carmes), from Arabic qirmiz "kermes," from Sanskrit krmi-ja a compound meaning "(red dye) produced by a worm."

The Sanskrit compound is krmih "worm" (from PIE root *kwrmi- "worm" and cognate with Lithuanian kirmis, Old Irish cruim, Albanian krimp "worm") + -ja- "produced" (from PIE *gene-; see genus). The insect lives in the Levant and southern Europe on a species of oak (kermes oak). They were esteemed from ancient times as a source of red and scarlet dye. The dye is harvested from pregnant females, which in that state resemble small roundish grains about the size of peas and cling immobile to the tree on which they live.

From this fact kermes dye was, for a long time, mistaken in Europe as being from a seed or excrescence of the tree, and the word for it in Greek was kokkos, literally "a grain, seed" (see cocco-). This was passed to Latin as coccum, coccus "berry [sic] yielding scarlet dye," in late use "scarlet color, scarlet garment." So important was kermes (coccus) as a commercial source of scarlet dye that derivatives of the name for it have displaced the original word for "red" in many languages, such as Welsh coch (from Latin), Modern Greek kokkinos. Compare also crimson (n.). Kermes dyes have been found in burial wrappings in Anglo-Scandinavian York, but the use of kermes dyes seems to have been lost in Europe from the Dark Ages until early 15c. It fell out of use again with the introduction of cochineal (the word for which might itself be from coccus) from the New World.
Cloths dyed with kermes are of a deep red colour; and though much inferior in brilliancy to the scarlet cloths dyed with real Mexican cochineal, they retain the colour better and are less liable to stain. The tapestries of Brussels and other parts of Flanders, which have scarcely lost any thing of their original brilliancy, even after a lapse of 200 years, were all dyed with kermes. [W.T. Brande, "Dictionary of Science, Literature, & Art," London, 1842]
kern (n.)youdaoicibaDictYouDict
1680s, "part of a metal type projecting beyond the body," as the head of an -f- or the tail of a -j-, from French carne "projecting angle, quill of a pen," from Latin cardinem "hinge."
kernel (n.)youdaoicibaDictYouDict
Old English cyrnel "seed, kernel, pip," from Proto-Germanic *kurnilo- (cognates: Middle High German kornel, Middle Dutch cornel), from the root of corn "seed, grain" (see corn (n.1)) + -el, diminutive suffix. Figurative sense of "core or central part of anything" is from 1550s.
kerosene (n.)youdaoicibaDictYouDict
1852, coined irregularly by Canadian geologist Abraham Gesner (1797-1864), who discovered how to distill it c. 1846, from Greek keros "wax" (see cere) + chemical suffix -ene. So called because it contains paraffin (hence the British English name, paraffin oil).
kerygma (n.)youdaoicibaDictYouDict
"preaching," 1889, from Greek kerygma "proclamation, preaching," from keryssein "to proclaim," related to keryx "herald."
kestrel (n.)youdaoicibaDictYouDict
kind of falcon, c. 1600, earlier castrell (15c.), probably from Middle French cresserelle, which apparently is related to crecerelle "rattle," from Latin crepitacillium "small rattle," diminutive of crepitaculum "noisy bell, rattle," from crepitare "to crackle, rattle;" possibly from the old belief that their noise frightened away other hawks.
ketamine (n.)youdaoicibaDictYouDict
1966, from keto-, comb. form of ketone, + amine.
ketch (n.)youdaoicibaDictYouDict
kind of small sailing vessel, 1650s, earlier catch (mid-15c.), cache (late 14c.), probably from Middle English cacchen "to capture, ensnare, chase" (see catch (v.)). Compare the sense development in yacht.
ketchup (n.)youdaoicibaDictYouDict
1711, said to be from Malay kichap, but probably not original to Malay. It might have come from Chinese koechiap "brine of fish," which, if authentic, perhaps is from the Chinese community in northern Vietnam [Terrien de Lacouperie, in "Babylonian and Oriental Record," 1889, 1890]. Catsup (earlier catchup, 1680s) is a failed attempt at Englishing, still in use in U.S., influenced by cat and sup.

Originally a fish sauce, the word came to be used in English for a wide variety of spiced gravies and sauces; "Apicius Redivivus; or, the Cook's Oracle," by William Kitchiner, London, 1817, devotes 7 pages to recipes for different types of catsup (his book has 1 spelling of ketchup, 72 of catsup), including walnut, mushroom, oyster, cockle and mussel, tomata, white (vinegar and anchovies figure in it), cucumber, and pudding catsup. Chambers's Encyclopaedia (1870) lists mushroom, walnut, and tomato ketchup as "the three most esteemed kinds." Tomato ketchup emerged c. 1800 in U.S. and predominated from early 20c.
ketone (n.)youdaoicibaDictYouDict
chemical group, 1851, from German keton, coined in 1848 by German chemist Leopold Gmelin (1788-1853) from German Aketon, from French acétone (see acetone). Its combining form is keto-.
ketosis (n.)youdaoicibaDictYouDict
1900, from keto-, comb. form of ketone, + -osis.
kettle (n.)youdaoicibaDictYouDict
Old English cetil (Mercian), from Proto-Germanic *katilaz (compare Old Saxon ketel, Old Frisian zetel, Middle Dutch ketel, Old High German kezzil, German Kessel), probably from Latin catillus "deep pan or dish for cooking," diminutive of catinus "bowl, dish, pot." One of the few Latin loan-words in Proto-Germanic, along with *punda- "measure of weight or money" (see pound (n.1)) and a word relating to "merchant" that yielded cheap (adj.). "[I]t is striking that all have something to do with trade" [Don Ringe, "From Proto-Indo-European to Proto-Germanic," Oxford 2006]. Spelling with a -k- (c. 1300) probably is from influence of Old Norse cognate ketill. The smaller sense of "tea-kettle" is attested by 1769.
kettledrum (n.)youdaoicibaDictYouDict
1540s, from kettle + drum (n.).
KevlaryoudaoicibaDictYouDict
registered trademark (DuPont) for a synthetic fiber developed there c. 1965.
kewyoudaoicibaDictYouDict
1939, as a clipped form of thank you.
kewlyoudaoicibaDictYouDict
1996 as a representation of a casual pronunciation of cool.
kewpie (n.)youdaoicibaDictYouDict
1909, American English, coined by their illustrator, Rose C. O'Neill (1874-1944), as an altered form of a diminutive of Cupid.
kex (n.)youdaoicibaDictYouDict
"dry, hollow plant stem," late 14c., of uncertain origin. Klein says ultimately from Latin cicuta "hemlock."
key (n.1)youdaoicibaDictYouDict
"metal piece that works a lock," from Old English cæg "key," of unknown origin, with no certain cognates other than Old Frisian kei. Perhaps related to Middle Low German keie "lance, spear" on notion of "tool to cleave with," from Proto-Germanic *ki- "to cleaver, split" (cognates: German Keil "wedge," Gothic us-kijans "come forth," said of seed sprouts, keinan "to germinate"). But Liberman writes, "The original meaning of *kaig-jo- was presumably '*pin with a twisted end.' Words with the root *kai- followed by a consonant meaning 'crooked, bent; twisted' are common only in the North Germanic languages." Modern pronunciation is a northern variant predominating from c. 1700; earlier it was often spelled and pronounced kay.

Figurative sense of "that which serves to open or explain" was in Old English; meaning "that which holds together other parts" is from 1520s. As "answer to a test," it is from chess, short for key move, "first move in a solution to a set problem." Musical sense of "tone, note" is 15c., but modern sense of "scale" is 1580s, probably as a translation of Latin clavis or French clef (see clef; also see keynote). Extended c. 1500 to "mechanism on a musical instrument." As a verb meaning "to scratch (a car's paint job) with a key" it is recorded by 1986.