A single four-leaf clover.Licensed from iStockPhoto
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio.
a leaf of clover with four leaflets on one leafstalk, popularly believed to bring good luck to the finder
Used by arrangement with John Wiley & Sons, Inc.
The American Heritage® Dictionary of the English Language, 4th edition Copyright © 2010 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
A clover leaf having four leaflets instead of the normal three, considered to be an omen of good luck.