Mal·bec (mäl-b?k?)n.1. A variety of French grape now cultivated especially in Argentina, used to make red wine, including Bordeaux and an Argentine varietal.2. A medium- to full-bodied red wine made from this grape.[French malbec, of unknown origin.]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.Malbec (mæl?b?k) n1. (Plants) a black grape originally grown in the Bordeaux region of France and now in Argentina and Chile, used for making wine2. (Brewing) a rustic mid-bodied red wine made from this grapeCollins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014