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 tropical Old World yam (Dioscorea bulbifera) having axillary potatolike tubers, some of which are edible after cooking. It is a weed in the tropics and Florida. Also called aerial yam, potato yam.