Definition of embryo sac in English:

embryo sac

Syllabification: em·bry·o sac

Entry from US English dictionary

noun

A cell inside the ovule of a flowering plant where fertilization occurs and which becomes the female gametophyte, containing the endosperm nucleus and the fertilized ovum that develops into the embryo.

Definition of embryo sac in:

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Word of the day demoralize
Pronunciation: dɪˈmɒrəlʌɪz
verb
cause (someone) to lose confidence or hope