rumen

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Definitions from WordNet

Noun rumen has 1 sense

rumen, first stomach - the first compartment of the stomach of a ruminant; here food is collected and returned to the mouth as cud for chewing
--₁ is a kind of stomach, tummy, tum, breadbasket
--₁ is a part of ruminant
Derived form: verb ruminate₁

Definitions from the Web

Rumen

Part of Speech: Noun

Definition 1: The largest of the four compartments of a ruminant animal's stomach, involved in the initial digestion of food through microbial fermentation.

Example 1: The rumen of a cow contains various microorganisms that help break down cellulose and other fibrous materials.

Definition 2: The first stomach of a cud-chewing mammal, such as a cow, sheep, or goat.

Example 2: The farmer observed the cow chewing its cud, indicating that the food had passed through the rumen.

Definition 3: A large and spacious cavity or compartment.

Example 3: The abandoned warehouse had become a rumen for rats and other small animals.