Student Dictionary

One entry found for rumen.
Main Entry: ru·men
Pronunciation: primarystressrü-mschwan
Function: noun
Inflected Form(s): plural ru·mi·na /-mschwa-nschwa /; or ru·mens
: the large first compartment of the stomach of a cud-chewing mammal (as a cow) in which cellulose is broken down by the action of microorganisms and in which food is stored prior to chewing

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