Bleeder
A horse that bleeds due to a ruptured blood vessel during a race or workout. The medication Lasix can fix this problem.
Fractions
The times recorded during the race; with timing starting just past the gate or when the gates open, then parroted for the quarter, half, three-quarters etc. Used as an indication of ability and speed.
Tack
The equipment the horse wears, including saddle and bridle. A jockey typically has their own racing saddle, placed on each horse they ride just before the race.