a person or thing that trains.
a staff member on an athletic team who gives first aid and therapy to injured players.
a person who trains athletes; coach.
a person who trains racehorses or other animals for contests, shows, or performances.
an airplane or a simulated aircraft used in training aircrew members, especially pilots.

1590–1600; train + -er1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
trainer (ˈtreɪnə)
1.  a person who trains athletes in a sport
2.  a piece of equipment employed in training, such as a simulated aircraft cockpit
3.  horse racing a person who schools racehorses and prepares them for racing
4.  (plural) an informal name for training shoes

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
Many of them are former jocks and personal trainers, etc, and academics have
  never really been a focus for them.
Therefore, when you go in to the gym, you are likely to be surrounded by
  unusually frequent trainers.
Some trainers and researchers think they detect subtle changes in human
  behavior or scent before an episode occurs.
Check out these amazing birds of prey as their trainers put them through their
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