Webster
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Webster’s Revised Unabridged Dictionary · 1913

Mucus

Mu′cus (mū′kŭs), n. [L. mucus, muccus; cf. mucere to be moldy or musty, Gr. μύξα mucus, and Skr. muc to release. Cf. Match for striking fire, Moist, Mucilage.] 1. (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.

2. (Physiol.) Any other animal fluid of a viscid quality, as the synovial fluid, which lubricates the cavities of the joints; — improperly so used.

3. (Bot.) A gelatinous or slimy substance found in certain algæ and other plants.

Webster’s Revised Unabridged Dictionary, Noah Porter, editor (Springfield, Mass.: G. & C. Merriam, 1913). Public domain. Text as transcribed by MICRA, Inc., from Project Gutenberg. Changed for Deep Dive Bible: Greek, which our source spelled in Latin letters, set in Greek letters; entries of one spelling merged into one article; Greek words our source left out (shown as “?”), read from the 1898 printing, from the same plates (the Library of Congress’s copy), where the place could be found with certainty.