Dictionary
meg•a•spore
Pronunciation: (meg'u-spôr", -spōr"), [key]—
n. Bot.
1. the larger of the two kinds of spores characteristically produced by seed plants and a few fern allies, developing into a female gametophyte. Cf.
microspore.
2. the embryo sac of a flowering plant.
Also called macrospore. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.