mucus

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.

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.

In botany, gummy matter soluble in water.

The slime of fish.

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.