Pari-Mutuel
A pool style wagering system, where all money input through betting is divided among those with winning tickets (save for various deductions by the track operators).
Objection
Claim of foul lodged by a jockey for perceived dangerous or illegal riding by a rival.
Trifecta
A wager picking the first, second and third horses in the exact order. A trifecta box means paying more to ensure the horses can finish in any order in the top three spots.