lead [LED]
Lead weights carried in pockets on both sides of the saddle, used to make up the difference between the actual weight of the jockey and the weight the horse has been assigned to carry during the race.
leaky roof circuit
Minor tracks.
length
A measurement approximating the length of a horse, used to denote distance between horses in a race.
listed race
A stakes race just below a group race or graded race in quality.
lock
Slang for a “sure” winner.
maiden
Breeding: A female that has never been bred.
Harness racing: A stallion, mare or gelding that has never won a heat or race at the gait at which it is entered to start and for which a purse is offered.
Thoroughbred racing: A horse or rider that has not won a race.