rapist (n.)

late 14c., rapen, "seize prey; abduct, take and carry off by force," from rape (n.) and from Anglo-French raper (Old French rapir) "to seize, abduct," a legal term, probably from Latin rapere "seize, carry off by force, abduct" (see rapid). Also figuring in alliterative or rhyming phrases, such as rape and renne (late 14c.) "seize and plunder."

The older senses of the English word became obsolete. The surviving meaning "to abduct (a woman), ravish;" also "seduce (a man)" is clearly by early 15c. in English, but it might have been at least part of the sense in earlier uses.

Meaning "to rob, strip, plunder" (a place) is from 1721, a partial revival of the old sense. Uncertain connection to Low German and Dutch rapen in the same sense. In Middle English, and occasionally after, the verb was used in figurative senses of Latin rapere, such as "transport in ecstasy, carry off to heaven," usually in past-participle rapte, which tends to blend with rapt. Related: Raped; raping.

Classical Latin rapere was used for "sexually violate," but only rarely; the usual Latin word being stuprare "to defile, ravish, violate," which is related to stuprum (n.) "illicit sexual intercourse," literally "disgrace," stupere "to be stunned, stupefied" (see stupid). Latin raptus, past participle of rapere, used as a noun meant "a seizure, plundering, abduction," but in Medieval Latin also "forcible violation."