n.
Pronunciation: ' m ī -kr ə - ˌ spo ̇ r
Function: noun
Etymology: International Scientific Vocabulary
Date: 1847
: any of the spores in heterosporous plants that give rise to male gametophytes and are generally smaller than the megaspore
– mi · cro · spo · rous \ ˌ m ī -kr ə - ' spo ̇ r- ə s, m ī - ' kräs-p ə -r ə s \ adjective