/tray"neuhr/ , n.
1. a person or thing that trains.
2. a staff member on an athletic team who gives first aid and therapy to injured players.
3. a person who trains athletes; coach.
4. a person who trains racehorses or other animals for contests, shows, or performances.
5. an airplane or a simulated aircraft used in training aircrew members, esp. pilots.
[ 1590-1600; TRAIN + -ER 1 ]