winged elmn. An elm (Ulmus alata) of the central and eastern United States, having twigs with flattened corky outgrowths. Also called wahoo2.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.winged? elm? n. a small tree, Ulmus alata, of SE North America, having twigs edged with flat, corky projections. [1810?20, Amer.] Random House Kernerman Webster’s College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.