- Bot. an asexual sporangial spore, esp. of certain fungi or algae, capable of independent motion usually by means of cilia or flagella
- Zool. a motile flagellate or amoebic reproductive cell arising from a sporocyst in certain protozoans
Origin of zoosporezoo- + spore
A motile flagellated asexually produced spore, as of certain algae, oomycetes, and fungi.