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microspore

[mahy-kruh-spawr, ‐spohr] /ˈmaɪ krəˌspɔr, ‐ˌspoʊr/
noun, Botany
1.
the smaller of the two kinds of spores characteristically produced by seed plants and some fern allies, developing into a male gametophyte.
Compare megaspore,
2.
a pollen grain.
Origin
1855-1860
1855-60; micro- + -spore
Related forms
microsporic
[mahy-kruh-spawr-ik, ‐spor‐] /ˌmaɪ krəˈspɔr ɪk, ‐ˈspɒr‐/ (Show IPA),
microsporous
[mahy-kruh-spawr-uh s, ‐spohr‐, mahy-kros-per-uh s] /maɪ krəˈspɔr əs, ‐ˈspoʊr‐, maɪˈkrɒs pər əs/ (Show IPA),
adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for microsporous

microspore

/ˈmaɪkrəʊˌspɔː/
noun
1.
the smaller of two types of spore produced by some spore-bearing plants, which develops into the male gametophyte Compare megaspore (sense 1)
2.
the pollen grain of seed plants
Derived Forms
microsporic, microsporous, 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 microsporous

microspore

n.

1856, from micro- + spore.

Online Etymology Dictionary, © 2010 Douglas Harper
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microsporous in Science
microspore
  (mīk'rə-spôr')   
One of the two types of haploid spores produced by a heterosporous plant. Microspores develop into male gametophytes and are usually smaller than megaspores. In angiosperms, the microspore develops into the pollen grain.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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