microzoospore

from The Collaborative International Dictionary of English v.0.48

Microzoospore \Mi`cro*zo"o*spore\
   (m[imac]`kr[-o]*z[=o]"[-o]*sp[=o]r), n. [Micro- + zoospore.]
   (Bot.)
   A small motile spore furnished with two vibratile cilia,
   found in certain green algae.
   [1913 Webster]