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rumen Line breaks: rumen
Pronunciation: /ˈruːmɛn/

Definition of rumen in English:

noun (plural rumens or rumina ˈruːmɪnə)

The first stomach of a ruminant, which receives food or cud from the oesophagus, 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.


Example sentences
  • Few studies have been conducted to examine the effects of live yeast products on in vitro mixed ruminal microorganism fermentation.
  • The effects of both S. cerevisiae supplements on the fermentation of soluble starch by mixed ruminal microorganisms are shown in Table 4.
  • Low quality forage also can negatively affect reproduction by decreasing efficiency of ruminal N utilization caused by limited energy supply.


Early 18th century: from Latin, literally 'throat'.

Definition of rumen in:
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