indusium

noun
in·du·si·um | \ in-ˈdü-zē-əm , -ˈdyü- , -zhē- \
plural indusia\in-ˈdü-zē-ə, -ˈdyü-, -zhē- \

Definition of indusium 

: an investing outgrowth or membrane especially : an outgrowth of a fern frond that covers the sori

First Known Use of indusium

1807, in the meaning defined above

History and Etymology for indusium

New Latin, from Latin, tunic

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The first known use of indusium was in 1807

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indusium

noun
in·du·si·um | \ in-ˈd(y)ü-z(h)ē-əm \
plural -sia\-z(h)ē-ə \

Medical Definition of indusium 

: a membrane serving as a covering especially : indusium griseum

More from Merriam-Webster on indusium

Britannica.com: Encyclopedia article about indusium

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