megasporophyll

noun
mega·​spo·​ro·​phyll | \-ˈspȯr-ə-ˌfil \

Definition of megasporophyll 

: a sporophyll that develops only megasporangia

First Known Use of megasporophyll

circa 1899, in the meaning defined above

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The first known use of megasporophyll was circa 1899

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