megasporangium

noun
mega·​spo·​ran·​gi·​um | \ˌme-gə-spə-ˈran-jē-əm \

Definition of megasporangium 

: a sporangium that develops only megaspores

First Known Use of megasporangium

1886, in the meaning defined above

History and Etymology for megasporangium

New Latin

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The first known use of megasporangium was in 1886

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