rumin: a branch of the esophagus where unchewed food is temporarily stored until it is regurgitated to the mouth for chewing.

http://www.bio-medicine.org/q-more/biology-dictionary/esopha...
http://www.biologyglossary.net/definition/2532-Rumin



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Note added at 24 mins (2008-04-02 16:39:02 GMT)
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UPDATE: The spelling "rumen" is more widely used than "rumin." Also, you could use the term "first stomach" instead of "rumen."

http://en.wikipedia.org/wiki/Ruminant

"A ruminant is any artiodactyl mammal that digests its food in two steps, first by eating the raw material and regurgitating a semi-digested form known as cud from within their first stomach, known as the rumen. The process of again chewing the cud to break down the plant matter and stimulate digestion is called ruminating. Ruminants include cattle, goats, sheep, camels, alpacas, llamas, giraffes, American Bison, European bison, yaks, water buffalo, deer, wildebeest and antelope."