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rumen Syllabification: ru·men
Pronunciation: /ˈro͞omən/

Definition of rumen in English:

noun (plural rumens or rumina-mənə)

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.
Example sentences
  • 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'.

Definition of rumen in:
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