Source : Webster's Revised Unabridged Dictionary (1913)

Motor \Mo"tor\, Motory \Mo"to*ry\, Motorial \Mo*to"ri*al\, a.
   [L. motorius that has motion. See {Motor}, n.]
   Causing or setting up motion; pertaining to organs of motion;
   -- applied especially in physiology to those nerves or nerve
   fibers which only convey impressions from a nerve center to
   muscles, thereby causing motion.