c. 1200, "protector, defender," from Old North French warant "defender; surety, pledge; justifying evidence" (Old French garant), from Frankish *warand, from Proto-Germanic *war- "to warn, guard, protect" (source also of Old High German werento "guarantor," noun use of present participle of weren "to authorize, warrant;" German gewähren "to grant"), from PIE root *wer- (4) "to cover."
Sense evolved via notion of "permission from a superior which protects one from blame or responsibility" (early 14c.) to "document conveying authority" (1510s). A warrant officer in the military is one who holds office by warrant (as from a government department), rather than by commission (from a head of state).
late 14c., "to restore to health or a sound state," from Old French curer and directly from Latin curare "take care of," hence, in medical language, "treat medically, cure" (see cure (n.1)). In reference to fish, pork, etc., "prepare for preservation by drying, salting, etc.," attested by 1743. Related: Cured; curing.
Most words for "cure, heal" in European languages originally applied to the person being treated but now can be used with reference to the disease. Relatively few show an ancient connection to words for "physician;" typically they are connected instead to words for "make whole" or "tend to" or even "conjurer." French guérir (with Italian guarir, Old Spanish guarir) is from a Germanic verb stem also found in in Gothic warjan, Old English wearian "ward off, prevent, defend" (see warrant (n.)).
"given to the use of low and indecent language," "using such language as only the licence of a buffoon can warrant" [Johnson], 1570s, from scurrile "coarsely joking" (implied in scurrility), from Latin scurrilis "buffoon-like," from scurra "fashionable city idler, man-about-town," later "buffoon." According to Klein's sources, "an Etruscan loan-word." Related: Scurrilously; scurrilousness. As a verb, scurrilize was tried (c. 1600).