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A spore that gives rise to a female gametophyte and is larger than a microspore.
1. (Botany) Also called: macrospore the larger of the two types of spore produced by some spore-bearing plants, which develops into the female gametophyte. Compare microspore1
2. (Botany) the cell in flowering plants that gives rise to the embryo sac
meg•a•spore(ˈmɛg əˌspɔr, -ˌspoʊr)
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.
meg`a•spor′ic (-ˈspɔr ɪk, -ˈspɒr-) adj.
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|Noun||1.||megaspore - larger of the two types of spore produced in heterosporous plants; develops in ovule into a female gametophyte|
spore - a small usually single-celled asexual reproductive body produced by many nonflowering plants and fungi and some bacteria and protozoans and that are capable of developing into a new individual without sexual fusion; "a sexual spore is formed after the fusion of gametes"