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Rumen (rangelands)
The large, first compartment of the stomach of a ruminant from which ingested food is regurgitated for re-chewing and in which digestion is aided by symbiotic action of microbes.
Source
Society for Range Management. 1998. Glossary of terms used in range management, fourth edition. Edited by the Glossary Update Task Group, Thomas E. Bedell, Chairman. Used with permission.