Definition of "abomasum" []

• The fourth division of the stomach in ruminant animals, such as cows, sheep, and deer, in which digestion takes place. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "The fourth compartment, known as the abomasum, is the deer's "true" stomach, and it functions in a very similar manner to yours."
• "  The fourth stomach, the abomasum, is most similar to the human stomach."
• "The fourth stomach, the abomasum, is most similar to the human stomach."