peregrine (n.)

also peregrin, type of falcon, 1550s, short for peregrine falcon (late 14c.), from Old French faulcon pelerin (mid-13c.), from Medieval Latin falco peregrinus, from Latin peregrinus "coming from foreign parts," from peregre (adv.) "abroad," properly "from abroad, found outside Roman territory," from per "away" (see per) + agri, locative of ager "field, territory, land, country" (from PIE root *agro- "field"). Sense may have been a bird "caught in transit," as opposed to one taken from the nest. Peregrine as an adjective in English meaning "not native, foreign" is attested from 1520s.