The Collaborative International Dictionary
Macrozoospore
Macrozoospore \Mac`ro*zo"["o]*spore\, n. [Macro- + zo["o]spore.] (Bot.) A large motile spore having four vibratile cilia; -- found in certain green alg[ae].
Wiktionary
macrozoospore
n. A large motile spore having four vibratile cilia; found in certain green algae.