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n. pl. oma·sa (-sə)
The third division of the stomach of a ruminant animal, located between the abomasum and the reticulum. Also called manyplies.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.
omasumone of four chambers in the RUMINANT STOMACH, lying between the fermentation section and the true stomach.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005