superfecta definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
a bet or betting procedure in which one wins if one correctly picks the first four finishers in a horse race in the order in which they finish
Origin: super- plush (per)fecta
superfecta definition by American Heritage Dictionary
A method of betting in which the bettor, in order to win, must pick the first four finishers of a race in the correct sequence.
Origin: super- + (per)fecta.