adjective
Wandering, travelling, migratory.
Not native to a region or country; foreign; alien.
(astrology, of a planet) Lacking essential debility.
Extrinsic or from without; exotic.
With "tone" Referring to the tonus peregrinus or 'wandering tone' in ecclesiastical chant and mode theory.
noun
The peregrine falcon.
(dated) A foreigner; a person resident in a country other than his or her own.