One that trots; especially, a horse trained to be driven in trotting matches.

a horse trained to trot; especially a horse trained for harness racing

a standardbred horse which races in a gait called the trot

In harness racing, horses which move with a diagonal gait.

Are horses whose legs on the opposite side of the body move at the same time. For example the right front and left rear move forward as the left front and right rear move back. Wagering