from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A membrane lining all body passages that communicate with the air, such as the respiratory and alimentary tracts, and having cells and associated glands that secrete mucus. Also called mucosa.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A membrane which secretes mucus. It forms the lining of various body passages that communicate with the air, such as the respiratory, genitourinary, and alimentary tracts including the mouth, nasal passages, vagina and urethra.
from the GNU version of the Collaborative International Dictionary of English
- adj. See under Membrane.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. mucus-secreting membrane lining all body cavities or passages that communicate with the exterior
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