Motor

n. [Lat., from movere, motum, to move; It. motore, Sp. motor, Fr. moteur.] One who, or that which, imparts motion; a source or originator of mechanical power; a moving power, as water, steam, animal strength, &c.

a. [Lat. motorius, from motor. See supra.] Giving motion; pertaining to organs of motion; as, motory muscles.