vail (n.)youdaoicibaDictYouDict[vail 词源字典]
"advantage, profit," early 15c., from vail (v.) "to be of use or service" (c. 1300), from Old French vail, from valoir "to be of value or worth" (see value (n.)).[vail etymology, vail origin, 英语词源]
vain (adj.)youdaoicibaDictYouDict
c. 1300, "devoid of real value, idle, unprofitable," from Old French vain, vein "worthless, void, invalid, feeble; conceited" (12c.), from Latin vanus "empty, void," figuratively "idle, fruitless," from PIE *wa-no-, from root *eue- "to leave, abandon, give out" (cognates: Old English wanian "to lessen," wan "deficient;" Old Norse vanta "to lack;" Latin vacare "to be empty," vastus "empty, waste;" Avestan va- "lack," Persian vang "empty, poor;" Sanskrit una- "deficient," Armenian unain "empty").

Meaning "conceited, elated with a high opinion of oneself" first recorded 1690s in English; earlier "silly, idle, foolish" (late 14c.). Phrase in vain "to no effect" (c. 1300, after Latin in vanum) preserves the original sense. Related: Vainly; vainness. Compare also vainglory.
vainglorious (adj.)youdaoicibaDictYouDict
early 15c., from vainglory + -ous, or from Old French vain glorios "boastful, swaggering." Related: Vaingloriously; vaingloriousness. Groce ("Classical Dictionary of the Vulgar Tongue," 3rd ed., 1796) has vain-glorious man "One who boasts without reason, or, as the canters say, pisses more than he drinks."
vainglory (n.)youdaoicibaDictYouDict
c. 1200, "worthless glory, undue pomp or show," waynglori, from Old French vaine glorie, from Medieval Latin vana gloria (see vain + glory (n.)).
vair (n.)youdaoicibaDictYouDict
"squirrel fur," or some other kind of fur in use in the Middle Ages, c. 1300, from Old French vair "two-toned squirrel fur; fur garments" (12c.), from Latin varium, masculine accusative singular of varius "parti-colored" (see vary). Gray or black above and white below.
valance (n.)youdaoicibaDictYouDict
piece of hanging, decorative drapery, mid-15c., of uncertain origin, probably from Anglo-French *valaunce, valence, from valer "go down, let down," variant of Old French avaler "descend, go down;" or possibly from the plural of Old French avalant, from present participle of avaler "go down." The notion is of something "hanging down." Not now considered to be from the name of Valence in southwestern France, which is from the Roman personal name Valentius. Related: Valenced.
vale (n.)youdaoicibaDictYouDict
river-land between two ranges of hills, early 14c., from Old French val "valley, vale" (12c.), from Latin vallem (nominative vallis, valles) "valley" (see valley). Now "little used except in poetry" [Century Dictionary]. Vale of years "old age" is from "Othello." Vale of tears "this world as a place of trouble" is attested from 1550s.
valediction (n.)youdaoicibaDictYouDict
"a farewell, a bidding farewell," 1610s, from past participle stem of Latin valedicere "bid farewell, take leave," from vale "farewell!," second person singular imperative of valere "be well, be strong" (see valiant) + dicere "to say" (see diction).
valedictorian (n.)youdaoicibaDictYouDict
"student who pronounces the oration at commencement exercises of his or her class," 1832, American English, from valedictory + -ian. As an adjective from 1834.
valedictory (adj.)youdaoicibaDictYouDict
1650s, "pertaining or relating to leave-taking," from Latin valedictum (past participle of valedicere; see valediction) + -ory. As a noun meaning "valedictory address" from 1779.
valence (n.)youdaoicibaDictYouDict
early 15c., "extract, preparation," from Latin valentia "strength, capacity," from valentem (nominative valens) "strong, stout, vigorous, powerful," present participle of valere "be strong" (see valiant). Meaning "relative combining capacity of an element" is recorded from 1884, from German Valenz (1868), from the Latin word. Related: Valency.
ValenciayoudaoicibaDictYouDict
place in Spain, Roman Valentia Edetanorum "fort of the Edetani," a local people name; the first element from Latin valentia "strength" (see valence (n.)).
Valentine (n.)youdaoicibaDictYouDict
mid-15c., "sweetheart chosen on St. Valentine's Day," from Late Latin Valentinus, the name of two early Italian saints (from Latin valentia "strength, capacity;" see valence). Choosing a sweetheart on this day originated 14c. as a custom in English and French court circles. Meaning "letter or card sent to a sweetheart" first recorded 1824. The romantic association of the day is said to be from it being around the time when birds choose their mates.
For this was on seynt Volantynys day
Whan euery bryd cometh there to chese his make.
[Chaucer, "Parlement of Foules," c. 1381]
Probably the date was the informal first day of spring in whatever French region invented the custom (many surviving medieval calendars reckon the start of spring on the 7th or 22nd of February). No evidence connects it with the Roman Lupercalia (an 18c. theory) or to any romantic or avian quality in either of the saints. The custom of sending special cards or letters on this date flourished in England c. 1840-1870, declined around the turn of the 20th century, and revived 1920s.
To speak of the particular Customs of the English Britons, I shall begin with Valentine's Day, Feb. 14. when young Men and Maidens get their several Names writ down upon Scrolls of Paper rolled up, and lay 'em asunder, the Men drawing the Maidens Names, and these the Mens; upon which, the Men salute their chosen Valentines and present them with Gloves, &c. This Custom (which sometimes introduces a Match) is grounded upon the Instinct of Animals, which about this Time of the Year, feeling a new Heat by the approach of the Sun, begin to couple. ["The Present State of Great Britain and Ireland" London, 1723]
Valentino (n.)youdaoicibaDictYouDict
"gigolo, good-looking romantic man," 1927, from Italian-born U.S. movie actor Rudolph Valentino (1895-1926), who was adored by female fans. His full name was Rodolfo Guglielmi di Valentino, from the Latin masc. proper name Valentinus (see Valentine).
valerian (n.)youdaoicibaDictYouDict
plant of Eurasia, cultivated for its medicinal root, late 14c., from Old French valeriane "wild valerian" (13c.), apparently from feminine singular of Latin adjective Valerianus, from the personal name Valerius (see Valerie); but Weekley writes, "some of the German and Scand. forms of the name point rather to connection with the saga-hero Wieland."
ValerieyoudaoicibaDictYouDict
fem. proper name, French, from Latin Valeria, fem. of Valerius, name of a Roman gens, from valere "to be strong" (see valiant).
valet (n.)youdaoicibaDictYouDict
"personal man-servant," mid-14c. (late 12c. as a surname), from Old French valet, variant of vaslet "man's servant, workman's assistant," originally "squire, young man, youth of noble birth" (12c.), from Gallo-Roman *vassellittus "young nobleman, squire, page," diminutive of Medieval Latin vassallus, from vassus "servant" (see vassal). Modern sense is usually short for valet de chambre; the general sense of "male household servant of the meaner sort" going with the variant form varlet. First recorded use of valet parking is from 1959.
valetudinarian (n.)youdaoicibaDictYouDict
"one who is constantly concerned with his own ailments," 1703, from valetudinary (1580s), from Latin valetudinarius, from valetudo "state of health" (either good or bad), from valere "be strong" (see valiant) + -tudo, abstract noun suffix (see -tude). Valetudinary (adj.) "sickly" is recorded from 1580s.
valgus (adj.)youdaoicibaDictYouDict
deformity in which a bone or joint is twisted outward from the center of the body; form of club-foot, 1800, from Latin valgus "bandy-legged, bow-legged, having the legs bent outward." Said to be probably related to Sanskrit valgati "to move up and down," Old English wealcan "to roll, move to and fro" (see walk (v.)), perhaps on the notion of "go irregularly or to and fro" [Tucker]. "Yet the main characteristic of 'bow-legged' is the crookedness of the legs, not 'going up and down' or 'to and fro'" [de Vaan] and there are phonetic difficulties. A classical word used in a different sense in modern medicine; also see varus.
Valhalla (n.)youdaoicibaDictYouDict
heavenly hall in which Odin receives the souls of heroes slain in battle, 1696 (in Archdeacon Nicolson's "English Historical Library"), from Old Norse Valhöll "hall of the battle-slain;" first element from valr "those slain in battle," from Proto-Germanic *walaz (cognates: Old English wæl "slaughter, bodies of the slain," Old High German wal "battlefield, slaughter"), from PIE root *wele- (2) "to strike, wound" (cognates: Avestan vareta- "seized, prisoner," Latin veles "ghosts of the dead," Old Irish fuil "blood," Welsh gwel "wound"). Second element is from höll "hall," from PIE root *kel- (2) "to conceal" (see cell). Reintroduced by 18c. antiquaries. Figurative sense is from 1845.