Etymology

pseudomembrane

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Today it means: A layer which resembles a membrane, especially one forming over a mucosal surface. Full definition →

First used 19th c.
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The story

From pseudo- + membrane.

First known use, by meaning

  • from 19th c. A layer which resembles a membrane, especially one forming over a mucosal surface.

Etymology from Wiktionary, CC BY-SA 4.0.