embryo sac
noun
plural embryo sacs
: the female gametophyte of a flowering plant consisting of a thin-walled sac within the nucellus that contains the egg nucleus and two polar nuclei which give rise to the endosperm on fertilization
Pollination involves the processes of pollen capture by the stigma, hydration, and pollen tube growth … to place the sperm cells they carry in the embryo sac in the ovule.—L. C. Sanders and E. M. Lord
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Merriam-Webster unabridged
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