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megaspore

[meg-uh-spawr, -spohr] /ˈmɛg əˌspɔr, -ˌspoʊr/
noun, Botany
1.
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.
2.
the embryo sac of a flowering plant.
Also called macrospore.
Origin
1885-1890
1885-90; mega- + spore
Related forms
megasporic
[meg-uh-spawr-ik, -spor-] /ˌmɛg əˈspɔr ɪk, -ˈspɒr-/ (Show IPA),
adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for megasporic

megaspore

/ˈmɛɡəˌspɔː/
noun
1.
Also called macrospore. the larger of the two types of spore produced by some spore-bearing plants, which develops into the female gametophyte Compare microspore (sense 1)
2.
the cell in flowering plants that gives rise to the embryo sac
Derived Forms
megasporic, adjective
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for megasporic

megaspore

n.

1857, from mega- + spore.

Online Etymology Dictionary, © 2010 Douglas Harper
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megasporic in Science
megaspore
  (měg'ə-spôr)   
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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