filter (v.)youdaoicibaDictYouDict[filter 词源字典]
1570s (transitive), from French filtrer or from Medieval Latin filtrare, from filtrum "felt" (see filter (n.)). The figurative sense is from 1830. Intransitive use from 1798. Related: Filtered; filtering.[filter etymology, filter origin, 英语词源]
filth (n.)youdaoicibaDictYouDict
Old English fylð "uncleanness, impurity, foulness," from Proto-Germanic *fulitho (cognates: Old Saxon fulitha "foulness, filth," Dutch vuilte, Old High German fulida), noun derivative of *fulo- "foul" (see foul (adj.)). A classic case of i-mutation.
filthy (adj.)youdaoicibaDictYouDict
late 12c., fulthe, "corrupt, sinful," from filth + -y (2). Meaning "physically unclean, dirty, noisome" is from late 14c. Meaning "morally dirty, obscene" is from 1530s.
In early use often hardly more emphatic than the mod. dirty; it is now a violent expression of disgust, seldom employed in polite colloquial speech. [OED]
Related: Filthily; filthiness.
filtrate (v.)youdaoicibaDictYouDict
1610s, probably a back-formation from filtration or else from Medieval Latin filtratus. Related: Filtrated; filtrating. As a noun, "liquid which has passed through a filter," from 1846.
filtration (n.)youdaoicibaDictYouDict
"act or process of filtering," c. 1600, perhaps from French filtration (1570s), noun of action from filter "to filter" (see filter (v.)).
fimbria (n.)youdaoicibaDictYouDict
"a fringing filament," from Late Latin fimbria (sing.), from Latin fimbriae (pl.), "fringe, border, threads." Related: Fimbriated (late 15c.); fimbrial.
fin (n.)youdaoicibaDictYouDict
Old English finn "fin," from Proto-Germanic *finno (cognates: Middle Low German vinne, Dutch vin), perhaps from Latin pinna "feather, wing" (see pin (n.)); or, less likely, from Latin spina "thorn, spine" (see spine).

U.S. underworld slang sense of "$5 bill" is 1925, from Yiddish finif "five," from German fünf (see five) and thus unrelated. The same word had been used in England in 1868 to mean "five pound note" (earlier finnip, 1839).
fin de siecle (adj.)youdaoicibaDictYouDict
1890, from French fin de siècle "end of century," phrase used as an adjective. At the time it meant "modern;" now it means "from the 1890s." "App. first in title of a comedy, Paris fin de siècle, produced at the Gymnase, Feb. 1890" [Weekley]. French siècle "century, age" is from Latin saeculum (see secular).
finagle (v.)youdaoicibaDictYouDict
"get dishonestly or deviously," 1926, American English, possibly a variant of English dialectal fainaigue "to cheat or renege" (at cards), which is of unknown origin. Liberman says finagle is from figgle, phonetic variant of fiddle "fidget about," frequentative of fig. Related: Finagled; finagling.
final (adj.)youdaoicibaDictYouDict
early 14c., from Old French final "final, last," and directly from Late Latin finalis "of or pertaining to an end, concluding, final," from finis "end" (see finish (v.)). As a noun, late 14c., "that which comes last;" meaning "final contest" in a sporting sense is from 1880. As a shortening of final examination, from 1880.
final solution (n.)youdaoicibaDictYouDict
1947, translation of German Endlösung, name given to Nazi Jewish policy from 1941.
finale (n.)youdaoicibaDictYouDict
1783, a musical term, from noun use of Italian finale "final," from Latin finalis "of or pertaining to an end" (see final). From 1724 as an Italian word in English. Figurative use by 1810.
finalise (v.)youdaoicibaDictYouDict
chiefly British English spelling of finalize. For suffix, see -ize. Related: Finalised; finalising.
finalist (n.)youdaoicibaDictYouDict
"competitor remaining after eliminations," 1896, from final + -ist. Earlier "one who believes the end has been reached" (1883).
finality (n.)youdaoicibaDictYouDict
1540s, "a goal, a guiding object," from Middle French finalité, from Late Latin finalitatem (nominative finalitas) "state of being final," from Latin finalis "last, of or pertaining to an end" (see final). From 1833 as "quality or state of being final."
finalize (v.)youdaoicibaDictYouDict
1850, from final + -ize. Related: Finalized; finalizing.
finally (adv.)youdaoicibaDictYouDict
late 14c., fynaly "at the end;" c. 1400, "completely, beyond recovery;" from final + -ly (2).
finals (n.)youdaoicibaDictYouDict
short for final exams, by 1890; see final (adj.).
finance (n.)youdaoicibaDictYouDict
c. 1400, "an end, settlement, retribution," from Old French finance "end, ending; pardon, remission; payment, expense; settlement of a debt" (13c.), noun of action from finer "to end, settle a dispute or debt," from fin (see fine (n.)). Compare Medieval Latin finis "a payment in settlement, fine or tax."

The notion is of "ending" (by satisfying) something that is due (compare Greek telos "end;" plural tele "services due, dues exacted by the state, financial means"). The French senses gradually were brought into English: "ransom" (mid-15c.), "taxation" (late 15c.); the sense of "management of money, science of monetary business" first recorded in English 1770.
finance (v.)youdaoicibaDictYouDict
late 15c., "to ransom" (obsolete), from finance (n.). Sense of "to manage money" is recorded from 1827; that of "to furnish with money" is from 1866. Related: Financed; financing.