[mahy-kruh-spawr, ‐spohr]
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 of microspore

First recorded in 1855–60; micro- + -spore
Related formsmi·cro·spor·ic [mahy-kruh-spawr-ik, ‐spor‐] /ˌmaɪ krəˈspɔr ɪk, ‐ˈspɒr‐/, mi·cro·spor·ous [mahy-kruh-spawr-uh s, ‐spohr‐, mahy-kros-per-uh s] /maɪ krəˈspɔr əs, ‐ˈspoʊr‐, maɪˈkrɒs pər əs/, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for microspore

Historical Examples of microspore

British Dictionary definitions for microspore


  1. the smaller of two types of spore produced by some spore-bearing plants, which develops into the male gametophyteCompare megaspore (def. 1)
  2. the pollen grain of seed plants
Derived Formsmicrosporic or 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

Word Origin and History for microspore

1856, from micro- + spore.

Online Etymology Dictionary, © 2010 Douglas Harper

microspore in Science


  1. 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 © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.