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n 1  :  any of the spores in heterosporous plants that give rise to male gametophytes and are generally smaller than the megaspore  2  :  the smaller of two forms of spores produced by various protozoans (as radiolarians) - compare MACROSPORE  .
Similar sounding terms:  mac·ro·spore  microspora 

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North Big Horn Hospital District (Lovell, Wyoming - Big Horn County)