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’.