D defs.my
Entry 2 senses Webster, 1913

Trainer

/trāʹnər/ · Train·er · IPA /ˈtɹeɪnɚ/
01 n. One who trains; an instructor; especially, one who trains or prepares men, horses, etc., for exercises requiring physical agility and strength.
  1. 1.
    One who trains; an instructor; especially, one who trains or prepares men, horses, etc., for exercises requiring physical agility and strength.
  2. 2.
    A militiaman when called out for exercise or discipline.[U. S.]