英语词源字典 - 在线词源网站

achtung [achtung 词源字典]: German word used to command attention, from German achtung, from acht (n.) "attention, care, heed, consideration," achten (v.) "pay attention to, regard, esteem, respect," from Old High German ahton "pay attention to," a general Germanic word akin to Old English eahtian "to estimate, esteem, consider, praise," but with no living native descendants in English.[achtung etymology, achtung origin, 英语词源]
achy (adj.): 1875, first recorded in George Eliot's letters, from ache (n.) + -y (2). Middle English had akeful "painful" (early 15c.). Related: Achily; achiness.
acid (adj.): 1620s, "of the taste of vinegar," from French acide (16c.) or directly from Latin acidus "sour, sharp," adjective of state from acere "to be sour," from PIE root *ak- "sharp, pointed" (see acrid). Figurative use from 1775; applied to intense colors from 1916. Acid test is American English, 1892, from the frontier days, when gold was distinguished from similar metals by application of nitric acid. Acid rain is first recorded 1859 in reference to England.
acid (n.): 1690s, from acid (adj.). Slang meaning "LSD-25" first recorded 1966 (see LSD).
When I was on acid I would see things that looked like beams of light, and I would hear things that sounded an awful lot like car horns. [Mitch Hedberg, 1968-2005, U.S. stand-up comic]
Acid rock (type played by or listen to by people using LSD) is also from 1966; acid house dance music style is 1988, probably from acid in the hallucinogenic sense + house "dance club DJ music style."
acidic (adj.): 1877, originally in geology; see acid (n.) + -ic.
acidity (n.): 1610s, from French acidité (26c.) or directly from Latin aciditatem (nominative aciditas), noun of quality from Latin acidus (see acid (adj.)).
acidophilus (adj.): 1920, used of milk fermented by acidophilic bacteria, from acidophil (1900), a hybrid word, from Latin acidus "acidic" (see acid (adj.)) + Greek philos "loving" (see -phile); the bacteria so called because they stain easily with an acid dye.
acidulous (adj.): 1769, "sub-acidic," used figuratively for "sour-tempered;" from Latin acidulus "slightly sour," a diminutive of acidus (see acid (adj.)).
ack: British oral code for letter A in wireless and telephone communication, 1898; hence ack-ack "anti-aircraft" (gun, fire, etc.).
ack-ack: 1939, representing A.A., the military abbreviation for anti-aircraft (see ack).
acknowledge (v.): 1550s, a blend of Middle English aknow (from Old English oncnawan "understand," from on + cnawan "recognize;" see know) and Middle English knowlechen "admit, acknowledge" (c. 1200; see knowledge). In the merger, a parasitic -c- slipped in, so that while the kn- became a simple "n" sound (as in know), the -c- stepped up to preserve, in this word, the ancient "kn-" sound. Related: Acknowledged; acknowledging.
acknowledgement (n.): 1590s, "act of acknowledging," from acknowledge + -ment. "An early instance of -ment added to an orig. Eng. vb." [OED]. Meaning "token of due recognition" is recorded from 1610s.
acknowledgment (n.): alternative form of acknowledgement. OED deems it "a spelling more in accordance with Eng. values of letters."
acme (n.): "highest point," 1560s, from Greek akme "(highest) point, edge; peak of anything," from PIE root *ak- "sharp" (see acrid). Written in Greek letters until c. 1620. The U.S. grocery store chain was founded 1891 in Philadelphia, Pennsylvania.
acne (n.): 1813, from Modern Latin, from aknas, a 6c. Latin clerical misreading of Greek akmas, accusative plural of akme "point" (see acme). The "pointed" pimples are the source of the medical use.
acolyte (n.): early 14c., "inferior officer in the church," from Old French acolite or directly from Medieval Latin acolytus (Late Latin acoluthos), from Greek akolouthos "following, attending on," literally "having one way," from a- "together with," copulative prefix, + keleuthose "a way, road, path, track," from PIE *qeleu- (cognates: Lithuanian kelias "way"). In late Old English as a Latin word.
acomia (n.): "baldness," Modern Latin, from Greek akomos "hairless," from a-, privative prefix (see a- (3)) + kome "hair" (see comet).
aconite (n.): poisonous plant (also known as monkshood and wolf's bane), 1570s, from French aconit, from Latin aconitum, from Greek akoniton, which is of unknown origin.
acorn (n.): Old English æcern "nut," common Germanic (cognates: Old Norse akarn, Dutch aker, Low German ecker "acorn," German Ecker, Gothic akran "fruit"), originally the mast of any forest tree, and ultimately related (via notion of "fruit of the open or unenclosed land") to Old English æcer "open land," Gothic akrs "field," Old French aigrun "fruits and vegetables" (from Frankish or some other Germanic source); see acre.

The sense gradually restricted in Low German, Scandinavian, and English to the most important of the forest produce for feeding swine, the mast of the oak tree. Spelling changed 15c.-16c. by folk etymology association with oak (Old English ac) and corn (n.1).
acoustic (adj.): c. 1600, from French acoustique, from Greek akoustikos "pertaining to hearing," from akoustos "heard, audible," verbal adjective from akouein "to hear," probably from copulative prefix a- (see a- (3)) + koein "to mark, perceive, hear," from PIE *kous- "to hear," which is perhaps from root *(s)keu- "to notice, observe" (see caveat). Acoustic guitar (as opposed to electric) attested by 1958. Related: Acoustical; acoustically.