Quinella is a way to bet on a horse race by picking the first two finishers, regardless of the order of their finishing.(noun)
An example of a quinella is betting which two horses will first finish in a race.
See quinella in Webster's New World College Dictionary
Origin: AmSp quiniela, orig. a ball game with five players (later a wager or combination of wagers on the scores of the players; hence any wager against the house) < quina, five (on dice) < L quini, five each < quinque, five
See quinella in American Heritage Dictionary 4
Origin: American Spanish quiniela
Origin: , diminutive of Spanish quina, keno
Origin: , from French quine; see keno.