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
Origin:
ME < OE cudu, cwudu, ball of cud, lit., what is rounded < IE base *gwet-, resin, gum > Ger kitt, cement, glue
See cud in American Heritage Dictionary 4
cud
noun
Food regurgitated from the first stomach to the mouth of a ruminant and chewed again.
Something held in the mouth and chewed, such as a quid of tobacco.