a mouthful of previously swallowed food regurgitated from the first two chambers of the stomach of cattle and other ruminants back to the mouth, where it is chewed slowly a second time
Webster’s New World College Dictionary, Fourth Edition, compiled by the
editors of Webster’s New World Dictionaries. Copyright © 2010 by Houghton
Mifflin Harcourt. Published by Houghton Mifflin Harcourt. All rights reserved.
Word origin of 'cud'ME < OE cudu, cwudu, ball of cud, lit., what is rounded < IE base *gwet-, resin, gum > Ger kitt, cement, glue