Dictionary.net

A regressive change in the mucus-secreting cells, or a pathological exaggeration of normal mucus-secretion, in which the cells undergo a change similar to cloudy swelling with deposits of mucoid material in and between the cells; also a conversion of any of the connective tissues into a gelatinous or mucoid substance.

Degeneration of tissue into a jelly-like substance containing mucin.

A variety of d. occurring usually in the connective tissue of senile atrophic organs, myxedema, sarcomata, fibromata, carcinomata, myxomata, and ovarian cysts.