ˈmīkrə+ˌ- noun
Etymology: International Scientific Vocabulary micr- + spore
1. : one of the spores of a heterosporous plant (as the pollen grain of a seed plant) that gives rise to male gametophytes and that is generally smaller than the megaspore
2. : the smaller of two forms of spores produced by various protozoans (as Radiolaria)
• mi·cro·spor·ic | ̷ ̷ ̷ ̷|spōrik or mi·cro·spor·ous | ̷ ̷ ̷ ̷|spōrəs, (ˈ)mī|kräspərəs adjective