[meg-uh-spawr, -spohr]
noun Botany.
the larger of the two kinds of spores characteristically produced by seed plants and a few fern allies, developing into a female gametophyte. Compare microspore.
the embryo sac of a flowering plant.
Also called macrospore.

1885–90; mega- + spore

megasporic [meg-uh-spawr-ik, -spor-] , adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
megaspore (ˈmɛɡəˌspɔː)
1.  Compare microspore Also called: macrospore the larger of the two types of spore produced by some spore-bearing plants, which develops into the female gametophyte
2.  the cell in flowering plants that gives rise to the embryo sac

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
megaspore   (měg'ə-spôr)  Pronunciation Key 
One of the two types of haploid spores produced by a heterosporous plant. Megaspores develop into female gametophytes and are usually larger than microspores.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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