Track Condition
Condition of the racetrack surface. Ex: fast; good; muddy; sloppy; frozen; hard; firm; soft; yielding; heavy.  

Trifecta
A wager picking the first three finishers in exact order. Called a "triactor" in Canada and a "triple" in some parts of the U.S.  

Trifecta Box
A trifecta wager in which all possible combinations using a given number of horses are bet upon.  

Trip
An individual horse's race, with specific reference to the difficulty (or lack of difficulty) the horse had during competition, e.g., whether the horse was repeatedly blocked or had an unobstructed run.  

Triple Crown
Used generically to denote a series of three important races, but is always capitalized when referring to historical races for three-year-olds. In the United States, the Kentucky Derby, Preakness Stakes and Belmont Stakes. In England the 2,000 Guineas, Epsom Derby and St. Leger Stakes. In Canada, the Queen's Plate, Prince of Wales Stakes and Breeders' Stakes.