noun, plural rumina [roo-muh-nuh] .
the first stomach of ruminating animals, lying next to the reticulum.

1720–30; < Latin rūmen throat, gullet Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
rumen (ˈruːmɛn)
n , pl -mens, -mina
the first compartment of the stomach of ruminants, behind the reticulum, in which food is partly digested before being regurgitated as cud
[C18: from Latin: throat, gullet]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
rumen   (r'mən)  Pronunciation Key 
The first and largest division of the stomach in ruminant animals, in which the food is fermented by microorganisms. See more at ruminant.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
We have been breeding cellulosic crops for the rumen animal and have made no progress.
The excess of protein-nitrogen in the rumen decreases absorption of magnesium.
But parrots don't have a rumen, nor do they rely on bacteria for digestion.
Rumen microbes could be considered a cow's best friend.
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