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append (v.)[append 词源字典]: late 14c., "to belong to as a possession or right," from Old French apendre (13c.) belong, be dependent (on); attach (oneself) to; hang, hang up," and directly from Latin appendere "to cause to hang (from something), weigh," from ad- "to" (see ad-) + pendere "hang" (see pendant).

Meaning "to hang on, attach as a pendant" is 1640s; that of "attach as an appendix" is recorded by 1843. OED says the original word was obsolete by c. 1500, and these later transitive senses represent a reborrowing from Latin or French. Related: Appended; appending.[append etymology, append origin, 英语词源]
appendage (n.): 1640s, from append + -age.
appendectomy (n.): 1891, a hybrid from appendix + -ectomy.
appendices (n.): proper Latin plural of appendix.
appendicitis (n.): 1886, from Latin stem of appendix, in the medical sense, + -itis "inflammation."
appendicular (adj.): 1650s, from Latin appendicula, diminutive of appendix + -ar.
appendix (n.): 1540s, "subjoined addition to a document or book," from Latin appendix "an addition, continuation, something attached," from appendere (see append). Used for "small outgrowth of an internal organ" from 1610s, especially in reference to the vermiform appendix. This sense perhaps from or influenced by French appendix, where the term was in use from 1540s.
apperceive (v.): c. 1300, from Old French apercevoir (see apperception). In modern psychological use, a back-formation from apperception. Related: Apperceived; apperceiving.
apperception (n.): 1753, from French aperception (17c.), from German Apperzeption (or Latin apperceptionem), coined by German mathematician and philosopher Gottfried Wilhelm Leibniz (1646-1716) as noun corresponding to French apercevoir "perceive, notice, become aware of" (11c., from Latin ad "to" (see ad-) + percipere; see perceive) on analogy of Perzeption/percevoir.
appertain (v.): late 14c., from Anglo-French apartenir, Old French apartenir (12c.) "be related to; be incumbent upon," from Late Latin appertinere "to pertain to," from ad- "to, completely" (see ad-) + pertinere "to belong to" (see pertain). To belong as parts to the whole, or as members to a family or class. Related: Appertained; appertaining.
appetence (n.): "strong desire," c. 1600, from French appétence "desire," from Latin appetentia "longing after something," noun of state from appetentem (nominative appetens), present participle of appetere, from ad "to" (see ad-) + petere "to seek, request" (see petition (n.)).
appetite (n.): c. 1300, "craving for food," from Anglo-French appetit, Old French apetit (13c.) "appetite, desire, eagerness," from Latin appetitus "appetite," literally "desire toward," from appetitus, past participle of appetere "to long for, desire; strive for, grasp at," from ad- "to" (see ad-) + petere "go to, seek out" (see petition (n.)).

Of other desires or cravings, from late 14c. As an adjective form, OED lists appetitious (1650s) and appetitual (1610s) as "obsolete," but appetitive (1570s) continues.
appetize (v.): "make hungry," 1782 (implied in appetized), irregularly formed (on model of verbs in -ize) from appetite, or else a back-formation from appetizing.
appetizer (n.): "something taken to whet the appetite," 1820, agent noun from appetize.
appetizing (adj.): "exciting desire or hunger," 1650s, from appetite on model of present participle adjective forms in -ing.
Appian Way: road between Rome and Capua, so called because it was begun (302 B.C.E.) by the consul Appius Claudius Caecus.
applaud (v.): late 15c. (implied in applauding), "to express agreement or approval; to praise," from Latin applaudere "to clap the hands in approbation, to approve by clapping hands; to strike upon, beat," from ad "to" (see ad-) + plaudere "to clap" (see plaudit). Sense of "express approval of" is from 1590s; that of "to clap the hands" is from 1590s. Figurative sense arrived in English before literal. Related: Applauded; applauding.
applause (n.): early 15c., from Latin applausus, past participle of applaudere "approve by clapping hands" (see applaud).
apple (n.): Old English æppel "apple; any kind of fruit; fruit in general," from Proto-Germanic *ap(a)laz (cognates: Old Saxon, Old Frisian, Dutch appel, Old Norse eple, Old High German apful, German Apfel), from PIE *ab(e)l "apple" (cognates: Gaulish avallo "fruit;" Old Irish ubull, Lithuanian obuolys, Old Church Slavonic jabloko "apple"), but the exact relation and original sense of these is uncertain (compare melon).
A roted eppel amang þe holen, makeþ rotie þe yzounde. ["Ayenbite of Inwit," 1340]
In Middle English and as late as 17c., it was a generic term for all fruit other than berries but including nuts (such as Old English fingeræppla "dates," literally "finger-apples;" Middle English appel of paradis "banana," c. 1400). Hence its grafting onto the unnamed "fruit of the forbidden tree" in Genesis. Cucumbers, in one Old English work, are eorþæppla, literally "earth-apples" (compare French pomme de terre "potato," literally "earth-apple;" see also melon). French pomme is from Latin pomum "apple; fruit" (see Pomona).
As far as the forbidden fruit is concerned, again, the Quran does not mention it explicitly, but according to traditional commentaries it was not an apple, as believed by Christians and Jews, but wheat. ["The Heart of Islam: Enduring Values for Humanity," Seyyed Hossein Nasr, 2002]
Apple of Discord (c. 1400) was thrown into the wedding of Thetis and Peleus by Eris (goddess of chaos and discord), who had not been invited, and inscribed kallisti "To the Prettiest One." Paris, elected to choose which goddess should have it, gave it to Aphrodite, offending Hera and Athene, with consequences of the Trojan War, etc.

Apple of one's eye (Old English), symbol of what is most cherished, was the pupil, supposed to be a globular solid body. Apple-polisher "one who curries favor" first attested 1928 in student slang. The image of something that upsets the apple cart is attested from 1788. Road apple "horse dropping" is from 1942.
apple pie: attested from 1580s, from apple + pie; noted by 1893 as a typical American dish. Apple-pie bed as a name for a childish prank is recorded from 1781; supposedly from the way of making apple turnovers, but some think it a folk etymology of French nappe pliée "folded sheet."