Bute

Shortened word for phenylbutazone, the common non-steroidal medication legal at most racetrack.

Morning Line

An approximation of expected odds in a race, quoted before actual odds are determined.

Main Track Only

A horse entered for main track only (MTO) is one hoping the weather forecast or track conditions will move the race off the turf course and onto the main track. They are scratched the morning of the race if the conditions stay dry.