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A clover leaf having four leaflets instead of the normal three, considered to be an omen of good luck.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
1. a clover with four leaves rather than three, supposed to bring good luck
2. (Automotive Engineering) another name for cloverleaf1
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
four-leaf clover[ˈfɔːˌliːfˈkləʊvəʳ] four-leaved clover [ˈfɔːˌliːvdˈkləʊvəʳ] n → quadrifoglio
Collins Italian Dictionary 1st Edition © HarperCollins Publishers 1995