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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.

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