noun (plural rumens or rumina /-mənə/)Zoology
The first stomach of a ruminant, which receives food or cud from the esophagus, partly digests it with the aid of bacteria, and passes it to the reticulum.
- When calves are fed milk it is funnelled through the oesophageal groove to the true stomach, bypassing the rumen.
- So mammals are unable to digest cellulose, except some ruminants that have cellulase-secreting bacteria in their rumens.
- He was interested in improving digestive processes within the rumen, the first of the four stomachs of ruminant animals, where cellulose is broken down by bacteria.
Early 18th century: from Latin, literally 'throat'.
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