英语词源字典 - 在线词源网站

let (v.)[let 词源字典]: Old English lætan "to allow to remain; let go, leave, depart from; leave undone; to allow; bequeath," also "to rent" (class VII strong verb; past tense let, past participle læten), from Proto-Germanic *letan (cognates: Old Saxon latan, Old Frisian leta, Dutch laten, German lassen, Gothic letan "to leave, let"), from PIE *le- (2) "to let go, slacken" (cognates: Latin lassus "faint, weary," Lithuanian leisti "to let, to let loose;" see lenient). If that derivation is correct, the primary sense would be "let go through weariness, neglect."

Of blood, from late Old English. To let (something) slip originally (1520s) was a reference to hounds on a leash; figurative use from 1540s. To let (someone) off "allow to go unpunished" is from 1814. To let on "reveal, divulge" is from 1725; to let up "cease, stop" is from 1787. Let alone "not to mention" is from 1812.[let etymology, let origin, 英语词源]
litany (n.): c. 1200, from Old French letanie and directly from Medieval Latin letania, Late Latin litania (source also of Spanish letania, Italian litania), from Greek litaneia "litany, an entreating," from lite "prayer, supplication, entreaty," of unknown origin. From notion of monotonous enumeration of petitions in Christian prayer services came generalized sense of "repeated series," early 19c., borrowed from French.
For those who know the Greek words, a litany is a series of prayers, a liturgy is a canon of public service; the latter in practice includes prayer, but does not say so. [Fowler]
provolone (n.): 1946, from Italian, augmentative of provola "cheese made from buffalo milk," from Medieval Latin probula, of uncertain origin.
Il nome non ha una derivazione precisa. L'etimologia, secondo alcuni, fa pensare alla parola napoletana prova-provola con cui in Campania viene indicato il classico latticino di bufala a pasta filata, da consumarsi fresco. ["Dieta Mediterranea"]
shrill (adj.): late 14c., schrylle "high-pitched, piercing" (of the voice), probably related to Old English scralletan "to sound loudly" and of imitative origin (compare Low German schrell, German schrill "piercing, shrill"). Related: Shrillness; shrilly (adv.).