embryo sac

noun

Definition of embryo sac

: the female gametophyte of a seed plant consisting of a thin-walled sac within the nucellus that contains the egg nucleus and other nuclei which give rise to endosperm on fertilization

First Known Use of embryo sac

1844, in the meaning defined above

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The first known use of embryo sac was in 1844

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Dictionary Entries Near embryo sac

embryophyte

embryo sac

embryotic

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Cite this Entry

“Embryo sac.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/embryo%20sac. Accessed 21 Sep. 2021.

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More from Merriam-Webster on embryo sac

Britannica.com: Encyclopedia article about embryo sac

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