fan (v.)youdaoicibaDictYouDict[fan 词源字典]
late Old English fannian "to winnow (grain)," from the noun (see fan (n.1)). Meaning "to stir up air" is from early 15c. Baseball sense of "strike out (a batter)" is by 1909. Related: Fanned; fanning. To fan out "spread out like a hand-held fan," is from 1590s.[fan etymology, fan origin, 英语词源]
fanatic (n.)youdaoicibaDictYouDict
1520s, "insane person," from Latin fanaticus "mad, enthusiastic, inspired by a god," also "furious, mad," originally, "pertaining to a temple," from fanum "temple, shrine, consecrated place," related to festus "festive" (see feast (n.)). Meaning "zealous person, person affected by enthusiasm" is from 1640s. As an adjective, in English, 1530s, "furious;" meaning "characterized by excessive enthusiasm," especially in religion (of Nonconformists), is from 1640s.
A fanatic is someone who can't change his mind and won't change the subject. [attributed to Winston Churchill]
fanatical (adj.)youdaoicibaDictYouDict
1540s, from fanatic + -al (1). Related: Fanatically.
fanaticism (n.)youdaoicibaDictYouDict
1650s, from fanatic + -ism.
fanboy (n.)youdaoicibaDictYouDict
"young male enthusiast," by 1988, from fan (n.2) + boy. Fangirl attested from 1989.
fancied (adj.)youdaoicibaDictYouDict
"imaginary, formed by the fancy," 1560s, past participle adjective from fancy (v.).
fancier (n.)youdaoicibaDictYouDict
"one with a special taste or aptitude (for something)," 1765, agent noun from fancy (v.).
fanciful (adj.)youdaoicibaDictYouDict
1620s, from fancy (n.) + -ful. Related: Fancifully.
fancy (n.)youdaoicibaDictYouDict
mid-15c., fantsy "inclination, liking," contraction of fantasy. It took the older and longer word's sense of "inclination, whim, desire." Meaning "the productive imagination" is from 1580s. That of "a fanciful image or conception" is from 1660s. Meaning "fans of an amusement or sport, collectively" is attested by 1735, especially (though not originally) of the prize ring. The adjective is recorded from 1751 in the sense "fine, elegant, ornamental" (opposed to plain); later as "involving fancy, of a fanciful nature" (1800). Fancy man attested by 1811.
fancy (v.)youdaoicibaDictYouDict
"take a liking to," 1540s, a contraction of fantasien "to fantasize (about)," from fantasy (n.). Meaning "imagine" is from 1550s. Related: Fancied; fancies; fancying. Colloquial use in fancy that, etc. is recorded by 1813.
fancy-free (adj.)youdaoicibaDictYouDict
"free from the trammels of love, having the 'fancy' or affection free," 1580s, from fancy (n.) + free (adj.).
fandangle (n.)youdaoicibaDictYouDict
1835, "useless ornamentation," Southern U.S., perhaps an alteration of fandango.
fandango (n.)youdaoicibaDictYouDict
mid-18c., lively Spanish dance, the word of unknown etymology [OED says "alleged to be of negro origin"], of uncertain origin. Perhaps related to fado (Watkins traces both to Latin fari "to speak"); fado is lovely but not lively, so perhaps the link, if any, is thematic. By extension in American English, "any noisy entertainment."
fandom (n.)youdaoicibaDictYouDict
"the realm of avid enthusiasts," 1903, from fan (n.2) + -dom.
fane (n.)youdaoicibaDictYouDict
"weathercock," late 14c., from Old English fana "flag, banner," from Proto-Germanic *fanon (cognates: Old Frisian fana, Gothic fana "piece of cloth," Old High German fano, German Fahne "flag, standard"); possibly cognate with Latin pannus "piece of cloth" (see pane).
fanfare (n.)youdaoicibaDictYouDict
c. 1600, "a flourish sounded on a trumpet or bugle," from French fanfare "a sounding of trumpets" (16c.), from fanfarer "blow a fanfare" (16c.), perhaps echoic, or perhaps borrowed (with Spanish fanfarron "braggart," and Italian fanfano "babbler") from Arabic farfar "chatterer," of imitative origin. French fanfaron also came into English 1670s with a sense "boastful."
fang (n.)youdaoicibaDictYouDict
Old English fang "prey, spoils, plunder, booty; a seizing or taking," from gefangen, strong past participle of fon "seize, take, capture," from Proto-Germanic *fango- (cognates: Old Frisian fangia, Middle Dutch and Dutch vangen, Old Norse fanga, German fangen, Gothic fahan), from PIE root *pag- "to make firm, fix;" connected to Latin pax (genitive pacis) "peace" (see pact).

The sense of "canine tooth" (1550s) was not in Middle English and probably developed from Old English fengtoð, literally "catching- or grasping-tooth." Compare German Fangzahn. Transferred to the venom tooth of a serpent, etc., by 1800.
fangled (adj.)youdaoicibaDictYouDict
1580s, "new-made," with implications of "foppish," from fangle (n.) "a new fancy, a novelty," based on newfangle "fond of novelty" (see newfangled).
Fannie Mae (n.)youdaoicibaDictYouDict
1948, from FNMA, acronym of "Federal National Mortgage Association," established 1938.
fanny (n.)youdaoicibaDictYouDict
"buttocks," 1920, American English, from earlier British meaning "vulva" (1879), perhaps from the name of John Cleland's heroine in the scandalous novel "Fanny Hill or Memoirs of a Woman of Pleasure" (1748). The fem. proper name is a diminutive of Frances. The genital sense is still the primary one outside U.S., but is not current in American English, a difference which can have consequences when U.S. TV programs and movies air in Britain.