英语词源字典 - 在线词源网站

fallacious (adj.)[fallacious 词源字典]: c. 1500, from fallacy (Latin fallacia) + -ous. Related: Fallaciously; fallaciousness.[fallacious etymology, fallacious origin, 英语词源]
fallacy (n.): late 15c., "deception, false statement," from Latin fallacia "deception, deceit, trick, artifice," noun of quality from fallax (genitive fallacis) "deceptive," from fallere "deceive" (see fail (v.)). Specific sense in logic, "false syllogism, invalid argumentation," dates from 1550s. An earlier form was fallace (c. 1300), from Old French fallace.
fallback: also fall-back, as a noun, "a reserve," 1851, from verbal phrase, from fall (v.) + back (adv.), which is attested in the sense of "retreat" from c. 1600. As an adjective, from 1767 as a type of chair; 1930 as "that may be used in an emergency."
fallen (adj.): c. 1400, past participle adjective from fall (v.). Used figuratively for "morally ruined" by 1620s, from the verb in the sense "yield to temptation" (especially in reference to women and chastity), attested from c. 1200. Meaning "those who have died" attested by 1765. Fallen angel is from 1680s; fallen woman by 1748.
fallibility (n.): 1630s, from Latin stem of fallible + -ity.
fallible (adj.): early 15c., from Medieval Latin fallibilis "liable to err, deceitful," literally "that can be deceived," from Latin fallere "deceive" (see fail (v.)).
falling (adj.): present participle adjective from fall (v.). Falling star is from 1560s; falling off "decrease, declining" is from c. 1600. Falling evil "epilepsy" is from early 13c.
Fallopian (adj.): 1706 in reference to the Fallopian tubes, from Latinized form of the name of Gabriello Fallopio (1523-1562), Italian anatomist who first described them.
fallout (n.): also fall-out, "radioactive particles," 1950, from fall (v.) + out (adv.).
fallow (n.): c. 1300, from Old English fealh "fallow land," from Proto-Germanic *falgo (cognates: Old High German felga "harrow," German Felge "plowed-up fallow land," East Frisian falge "fallow," falgen "to break up ground"), perhaps from a derivation of PIE root *pel- (3) "to turn, fold." Assimilated since Old English to fallow (adj.), according to OED probably because of the color of plowed earth. Originally "plowed land," then "land plowed but not planted" (1520s). As an adjective, from late 14c.
fallow (adj.): "pale yellow, brownish yellow," Old English fealu "reddish yellow, yellowish-brown, tawny, dusk-colored" (of flame, birds' feet, a horse, withered grass or leaves, waters, roads), from Proto-Germanic *falwa- (cognates: Old Saxon falu, Old Norse fölr, Middle Dutch valu, Dutch vaal, Old High German falo, German falb), from PIE *pal-wo- "dark-colored, gray" (cognates: Old Church Slavonic plavu, Lithuanian palvas "sallow;" Greek polios "gray" (of hair, wolves, waves), Sanskrit palitah, Welsh llwyd "gray;" Latin pallere "to be pale"), suffixed form of root *pel- (2) "pale" (see pallor). It also forms the root of words for "pigeon" in Greek (peleia), Latin (palumbes), and Old Prussian (poalis). Related: Fallow-deer.
false (adj.): late Old English, "intentionally untrue, lying," of religion, "not of the true faith, not in accord with Christian doctrines," from Old French fals, faus "false, fake; incorrect, mistaken; treacherous, deceitful" (12c., Modern French faux), from Latin falsus "deceptive, feigned, deceitful, pretend," also "deceived, erroneous, mistaken," past participle of fallere "deceive, disappoint," which is of uncertain origin (see fail (v.)).

Adopted into other Germanic languages (cognates: German falsch, Dutch valsch, Old Frisian falsk, Danish falsk), though English is the only one in which the active sense of "deceitful" (a secondary sense in Latin) has predominated. From c. 1200 as "deceitful, disloyal, treacherous; not genuine;" from early 14c. as "contrary to fact or reason, erroneous, wrong." False alarm recorded from 1570s. False step (1700) translates French faux pas. To bear false witness is attested from mid-13c.
falsehood (n.): c. 1300, falshede, "deceitfulness," also "a lie; that which is false," from false + -hood. Formed on the same pattern are Old Frisian falschede, Dutch valschheid, German Falschheit, Swedish falskhet. Former noun forms in English, now extinct, included falsage "wrongdoing" (late 15c.), falsdom "deceitfulness, treachery; a lie" (c. 1300), fals-lek "falsehood" (early 14c.), falsshipe "deceitfulness, dishonesty" (c. 1200).
falsely (adv.): c. 1200, "with intent to deceive, deceitfully," from false + -ly (2). From c. 1300 as "wrongly; untruthfully;" early 14c. as "incorrectly."
falseness (n.): c. 1300, "deceitfulness, treachery, faithlessness, dishonesty," from false + -ness.
falsetto (n.): "artificially high voice," 1774, from Italian falsetto, diminutive of falso "false," from Latin falsus (see false). Earlier in an Englished form as falset (1707). One who sings thus is a falsettist.
falsies (n.): "padded brassiere," 1943, from false + -ie.
falsifiable (adj.): 1610s, from falsify + -able or from French falsifiable. Related: Falsifiability.
falsification (n.): 1560s, from Late Latin falsificationem (nominative falsificatio), noun of action from past participle stem of falsificare "to falsify" (see falsify).
falsify (v.): mid-15c., "to prove false," from Middle French falsifier (15c.), from Late Latin falsificare "make false, corrupt," from Latin falsus "erroneous, mistaken" (see false). Meaning "to make false" is from c. 1500. Earlier verb was simply falsen (c. 1200). Related: Falsified; falsifying.