Mucus

[myoo-kuh s] /ˈmyu kəs/

noun
1.
a viscous, slimy mixture of mucins, water, electrolytes, epithelial cells, and leukocytes that is secreted by glands lining the nasal, esophageal, and other body cavities and serves primarily to protect and lubricate surfaces.
/ˈmjuːkəs/
noun
1.
the slimy protective secretion of the mucous membranes, consisting mainly of mucin
n.

1660s (replacing Middle English mucilage), from Latin mucus “slime, mold, mucus of the nose, snot,” from PIE root *meug- “slippery, slimy,” with derivatives referring to wet or slimy substances or conditions (cf. Latin emungere “to sneeze out, blow one’s nose,” mucere “be moldy or musty,” Greek myssesthai “to blow the nose,” myxa “mucus,” mykes “fungus,” Sanskrit muncati “he releases”). Old English had horh, which may be imitative.

mucus mu·cus (myōō’kəs)
n.
The viscous slippery substance that consists chiefly of mucin, water, cells, and inorganic salts and that is secreted as a protective lubricant coating by the cells and glands of the mucous membranes.
mucus
(my’kəs)
The slimy, viscous substance secreted as a protective lubricant by mucous membranes. Mucus is composed chiefly of large glycoproteins called mucins and inorganic salts suspended in water.

A slippery and somewhat sticky fluid secreted by the glands in mucous membranes. Mucus lubricates and protects the mucous membranes.