mesozoan(redirected from mesozoans)
Any of various small wormlike animals that are parasites of marine invertebrates and have an inner layer of one or more cells surrounded by an outer layer of ciliated cells.
[From New Latin Mesozōa, former phylum name : meso- (because the animals were considered to be intermediate between the protozoans and the metazoans in structure) + -zōa, pl. of -zōon, animal; see -zoon.]
(Animals) any of several wormlike parasites of the group Mesozoa that live in marine vertebrates