beautyyoudaoicibaDictYouDict[beauty 词源字典]
beauty: [13] Beauty came via Anglo-Norman beute and Old French bealte from Vulgar Latin *bellitas, a derivative of Latin bellus ‘beautiful’ (this developed from an earlier, unrecorded *dwenolos, a diminutive form of Old Latin *duenos, *duonos, which is related to Latin bonus ‘good’ – source of English bonus [18], bounty [13], and bounteous [14]).

Other English words from the same ultimate source are beau [17] and its feminine form belle [17]; beatific [17], which comes from Latin beātus ‘blessed, happy’, the past participle of the verb beāre, a relative of bellus; embellish; and bibelot ‘small ornament’ [19], originally a French word based ultimately on *belbel, a reduplication of Old French bel ‘beautiful’.

English beautiful is 15th century.
=> beau, belle, beatific, bibelot, bonus, bounty, embellish[beauty etymology, beauty origin, 英语词源]
beauty (n.)youdaoicibaDictYouDict
early 14c., "physical attractiveness," also "goodness, courtesy," from Anglo-French beute, Old French biauté "beauty, seductiveness, beautiful person" (12c., Modern French beauté), earlier beltet, from Vulgar Latin bellitatem (nominative bellitas) "state of being handsome," from Latin bellus "pretty, handsome, charming," in classical Latin used especially of women and children, or ironically or insultingly of men, perhaps from PIE *dw-en-elo-, diminutive of root *deu- (2) "to do, perform; show favor, revere" (see bene-). Famously defined by Stendhal as la promesse de bonheur "the promise of happiness."
[I]t takes the one hundred men in ten million who understand beauty, which isn't imitation or an improvement on the beautiful as already understood by the common herd, twenty or thirty years to convince the twenty thousand next most sensitive souls after their own that this new beauty is truly beautiful. [Stendhal, "Life of Henry Brulard"]
Replaced Old English wlite. Concrete meaning "a beautiful woman" is first recorded late 14c. Beauty sleep "sleep before midnight" is attested by 1850. Beauty spot is from 1650s. Beauty parlor is from 1894.
The sudden death of a young woman a little over a week ago in a down-town "beauty parlor" has served to direct public attention to those institutions and their methods. In this case, it seems, the operator painted on or injected into the patron's facial blemish a 4-per-cent cocaine solution and then applied an electrode, the sponge of which was saturated with carbolized water. ["The Western Druggist," October 1894]
Beauté du diable (literally "devil's beauty") is used as a French phrase in English from 1825.