megagametophyte

noun
mega·ga·me·to·phyte | \-gə-ˈmē-tə-ˌfīt \

Definition of megagametophyte 

: the female gametophyte produced by a megaspore

First Known Use of megagametophyte

1915, in the meaning defined above

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The first known use of megagametophyte was in 1915

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