1870, "of or pertaining to locomotion;" probably based on locomotion (as motor/motion). Earlier as a noun, "something with locomotive power" (1822). Related: Locomotory; locomotorial.
Entries linking to locomotor
locomotion n.
1640s, "action or power of motion," from Latin loco "from a place" (ablative of locus "a place;" see locus) + motionem (nominative motio) "motion, a moving" (see motion (n.)). From 1788 as "movement from place to place."