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fed (adj.)[fed 词源字典]: past participle adjective from feed (v.). Fed up "surfeited, disgusted, bored," is British slang first recorded 1900 (some early uses connect it to the Boer War), extended to U.S. by World War I; probably from earlier phrases like fed up to the back teeth. Earlier it was used of livestock, "fatten up by feeding." The notion probably is the same one in to have had enough "to have had too much."[fed etymology, fed origin, 英语词源]
fedayeen (n.): partisans or irregulars in the Middle East, from Arabic plural of fedai "devotee, zealot, one who risks life for a cause," from Persian fidai.
federal (adj.): 1640s, as a theological term (in reference to "covenants" between God and man), from French fédéral, an adjective formed from Latin foedus (genitive foederis) "covenant, league, treaty, alliance," from PIE *bhoid-es-, from root *bheidh- "to trust" (which also is the source of Latin fides "faith;" see faith).

Secular meaning "pertaining to a covenant or treaty" (1650s) led to political sense of "formed by agreement among independent states" (1707), from use of the word in federal union "union based on a treaty" (popularized during formation of U.S.A. 1776-1787) and like phrases. Also from this period in U.S. history comes the sense "favoring the central government" (1788) and the especial use of the word (as opposed to confederate) to mean a state in which the federal authority is independent of the component parts within its legitimate sphere of action. Used from 1861 in reference to the Northern forces in the American Civil War.
federalism (n.): 1788, "doctrine of federal union in government," American English, from French fédéralisme, from fédéral (see federal). Also, from about the same time and place, "doctrines of the Federalist Party in American politics."
federalist (n.): 1787, American English, "member or supporter of the Federal party in U.S. politics" (originally of supporters of the Philadelphia constitution), from federal + -ist. General sense of "one who supports federal union" is from 1792. The party expired c. 1824. As an adjective by 1801.
federate (v.): 1814 (implied in federated), a back-formation from federation, or else from Latin foederatus "leagued, federated, combined; having a treaty, bound by treaty," past participle of foederare "to establish by treaty," from foedus "covenant, treaty, alliance" (see federal). Related: Federating. As an adjective, by 1710.
federation (n.): 1721, "union by agreement," from French fédération, from Late Latin foederationem (nominative foederatio), noun of action from Latin foederare "league together," from foedus "covenant, league" (see federal).
fedora (n.): type of hat, 1887, American English, from "Fédora," a popular play by Victorien Sardou (1831-1908) that opened 1882, in which the heroine, a Russian princess named Fédora Romanoff, originally was performed by Sarah Bernhardt. During the play, Bernhardt, a notorious cross-dresser, wore a center-creased, soft brimmed hat. Women's-rights activists adopted the fashion. The proper name is Russian fem. of Fedor, from Greek Theodoros, literally "gift of god," from theos "god" (see theo-) + doron "gift" (see date (n.1)).
fee (n.): Middle English, representing the merger or mutual influence of two words, one from Old English, one from an Old French form of the same Germanic word, and both ultimately from a PIE root meaning "cattle."

The Old English word is feoh "livestock, cattle; movable property; possessions in livestock, goods, or money; riches, treasure, wealth; money as a medium of exchange or payment," from Proto-Germanic *fehu- (cognates: Old Saxon fehu, Old High German fihu, German Vieh "cattle," Gothic faihu "money, fortune"). This is from PIE *peku- "cattle" (cognates: Sanskrit pasu, Lithuanian pekus "cattle;" Latin pecu "cattle," pecunia "money, property").

The other word is Anglo-French fee, from Old French fieu, a variant of fief "possession, holding, domain; feudal duties, payment" (see fief), which apparently is a Germanic compound in which the first element is cognate with Old English feoh.

Via Anglo-French come the legal senses "estate in land or tenements held on condition of feudal homage; land, property, possession" (c. 1300). Hence fee-simple (late 14c.) "absolute ownership," as opposed to fee-tail (early 15c.) "entailed ownership," inheritance limited to some particular class of heirs (second element from Old French taillir "to cut, to limit").

The feudal sense was extended from landholdings to inheritable offices of service to a feudal lord (late 14c.; in Anglo-French late 13c.), for example forester of fe "a forester by heritable right." As these often were offices of profit, the word came to be used for "remuneration for service in office" (late 14c.), hence, "payment for (any kind of) work or services" (late 14c.). From late 14c. as "a sum paid for a privilege" (originally admission to a guild); early 15c. as "money payment or charge exacted for a license, etc."
fee-faw-fum (interj.): exclamation of the giant in "Jack the Giant-Killer," c. 1600.
feeb (n.): slang for "feeble-minded person," by 1914, American English, from feeble. Other words used in the same sense were feeble (n.), mid-14c.; feebling (1887).
feeble (adj.): late 12c., "lacking strength or vigor" (physical, moral, or intellectual), from Old French feble "weak, feeble" (12c., Modern French faible), dissimilated from Latin flebilis "lamentable," literally "that is to be wept over," from flere "weep, cry, shed tears, lament," from PIE *bhle- "to howl" (see bleat (v.)). The first -l- was lost in Old French. The noun meaning "feeble person" is recorded from mid-14c.
feeble-minded (adj.): also feebleminded, 1530s; see feeble + minded. Related: Feeble-mindedness.
feebleness (n.): c. 1300, from feeble + -ness.
feebly (adv.): late 13c., from feeble + -ly (2).
feed (v.): Old English fedan "nourish, give food to, sustain, foster" (transitive), from Proto-Germanic *fodjan (cognates: Old Saxon fodjan, Old Frisian feda, Dutch voeden, Old High German fuotan, Old Norse foeða, Gothic fodjan "to feed"), from PIE root *pa- "to protect, feed" (see food). Intransitive sense "take food, eat" is from late 14c. Meaning "to supply to as food" is from 1818.
feed (n.): "action of feeding," 1570s, from feed (v.). Meaning "food for animals" is first attested 1580s. Meaning "a sumptuous meal" is from 1808. Of machinery, "action of or system for providing raw material" from 1892.
feedback (n.): 1920, in the electronics sense, "the return of a fraction of an output signal to the input of an earlier stage," from verbal phrase, from feed (v.) + back (adv.). Transferred use, "information about the results of a process" is attested by 1955.
feeder (n.): early 15c., "one who feeds (an animal);" 1560s, "one who eats;" agent noun from feed (v.). As a mechanical apparatus for conveying materials, from 1660s. Of cattle and streams, by 1790s; of roads and railroads, by 1850s.
feeding (n.): "act of taking food," Old English feding, verbal noun from feed (v.). Feeding frenzy is from 1989, metaphoric extension of a phrase that had been used of sharks since 1950s.