Noun
pseudomembrane (plural pseudomembranes)
(medicine, pathology) A layer which resembles a membrane, especially one forming over a mucosal surface. [from 19th c.]
Pseudomembranous colitis can follow, creating generalized inflammation of the colon and the development of "pseudomembrane", a viscous collection of inflammatory cells, fibrin, and necrotic cells. Source: Internet
In 1826, Pierre Bretonneau gave the disease the name diphthérite (from Greek diphthera "leather") describing the appearance of pseudomembrane in the throat. Source: Internet