Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun The viscous, slippery substance that consists chiefly of mucin, water, cells, and inorganic salts and is secreted as a protective lubricant coating by cells and glands of the mucous membranes.

from The Century Dictionary.

  • noun A viscid fluid secreted by the mucous membrane of animals. It is characterized by the presence of considerable quantities of mucin. Also called animal mucilage.
  • noun In botany, gummy matter soluble in water.
  • noun The slime of fish

from the GNU version of the Collaborative International Dictionary of English.

  • noun (Physiol.) A viscid fluid secreted by mucous membranes, which it serves to moisten and protect. It covers the lining membranes of all the cavities which open externally, such as those of the mouth, nose, lungs, intestinal canal, urinary passages, etc.
  • noun (Physiol.) Any other animal fluid of a viscid quality, as the synovial fluid, which lubricates the cavities of the joints; -- improperly so used.
  • noun (Bot.) A gelatinous or slimy substance found in certain algæ and other plants.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun physiology A slippery secretion from the lining of the mucous membranes.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun protective secretion of the mucus membranes; in the gut it lubricates the passage of food and protects the epithelial cells; in the nose and throat and lungs it can make it difficult for bacteria to penetrate the body through the epithelium

Etymologies

from The American Heritage® Dictionary of the English Language, 4th Edition

[Latin mūcus.]

from Wiktionary, Creative Commons Attribution/Share-Alike License

Borrowed from Latin mūcus.

Examples

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