cud -
The portion of food which is brought back into the mouth by ruminatinganimals from their first stomach, to be chewed a second time.
Wikipedia
Cud is a portion of food that returns from a ruminant's stomach in the mouth to be chewed for the second time. More accurately, it is a bolus of semi-degraded food regurgitated from the reticulorumen of a ruminant. Cud is produced during the physical digestive process of rumination, or "chewing the cud".
