A layer of loose connective tissue beneath a mucous membrane.(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.
Use "submucosa" in a sentence
"Some substances, especially those which are poorly ionized in plasma (such as weak bases), may passively diffuse through the walls of the capillaries, through the intestinal submucosa, and into the intestinal lumen to be eliminated in feces."
"A thin layer of mesoblast, probably the submucosa, _sl_, lies beneath the epithelium and projects up into the folds."
"The nasal cavity has extensive capillary plexuses in the mucosa and submucosa."