The Collaborative International Dictionary of English v.0.48:
Mucous \Mu"cous\, a. [L. mucosus, fr. mucus mucus.]
1. Of, pertaining to, or resembling, mucus; slimy, ropy, or
stringy, and lubricous; as, a mucous substance.
2. Secreting a slimy or mucigenous substance; as, the mucous
Mucous membrane. (Anat.) See under Membrane.
Mucous patches (Med.), elevated patches found in the mucous
membranes of the mouth and anus, usually due to syphilis.
Mucous tissue (Anat.), a form of connective tissue in an
early stage of development, found in the umbilical cord
and in the embryo, and also in certain tumors called