microspore

n. Botany
The smaller of two types of spores that give rise to a male gametophyte.

microsporic mi'cro·spo'ric or mi'cro·spo'rous (mī'krə-spôr'əs, -spōr'-, mī-krŏs'pər-əs) adj.

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The noun has one meaning:

Meaning #1: smaller of the two types of spore produced in heterosporous plants; develops in the pollen sac into a male gametophyte

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