trainer

UK: /ˈtreɪnə^r/ US: /ˈtreɪnɚ/ ,(trā′nər)

WordReference Random House Learner's Dictionary of American English © 2025

train•er /ˈtreɪnɚ/   n. [countable]

1. one who coaches others, as in sports:
   a boxing trainer.
2. one who trains animals.

WordReference Random House Unabridged Dictionary of American English © 2025

train•er  (trā′nər), 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.

• train + -er¹ 1590–1600

Collins Concise English Dictionary © HarperCollins Publishers::

trainer / ˈtreɪnə/ noun

1. a person who trains athletes in a sport
2. a piece of equipment employed in training, such as a simulated aircraft cockpit
3. a person who schools racehorses and prepares them for racing
4. (plural)
   an informal name for training shoes