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The Collaborative International Dictionary
Embryo sac

Embryo sac \Em"bry*o sac`\ (Bot.) See under Embryonic.

Wiktionary
embryo sac

alt. The megagametophyte in a flowering plant. n. The megagametophyte in a flowering plant.

Usage examples of "embryo sac".

She ran her hand over the opaque embryo sac, completely in awe that she’.