indusium

noun
in·​du·​si·​um | \ in-ˈdü-zē-əm How to pronounce indusium (audio) , -ˈdyü-, -zhē-\
plural indusia\ in-​ˈdü-​zē-​ə How to pronounce indusia (audio) , -​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 How to pronounce indusium (audio) \
plural indusia\ -​z(h)ē-​ə How to pronounce indusia (audio) \

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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