microspore

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.

noun

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

n.1856, from micro- + spore.

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.