SG Heritage Dictionary

Mucus [Noun] Webster's Dictionary 1828

1. A viscid fluid secreted by the mucous membrane, which it serves to moisten and defend. 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. It differs from gelatine.

2. In the action of chewing, the mucus mixeth with the ailment.

3. This term has also been applied to other animal fluids of a viscid quality, as the synovial fluid, which lubricates the cavities of the joints.

Mucus [Noun] Webster's Dictionary 1913

1. 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. Any other animal fluid of a viscid quality, as the synovial fluid, which lubricates the cavities of the joints; -- improperly so used.

3. A gelatinous or slimy substance found in certain algae and other plants.

Mucusin [Noun] Webster's Dictionary 1913

Mucin.