epiphragm

noun
ep·i·phragm | \ ˈe-pə-ˌfram \

Definition of epiphragm 

: a closing membrane or septum (as of a snail shell or a moss capsule)

First Known Use of epiphragm

circa 1854, in the meaning defined above

History and Etymology for epiphragm

Greek epiphragma covering

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The first known use of epiphragm was circa 1854

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