\Tur`bel*la"ri*a\, n. pl. [NL., dim. fr. L. turbo a
whirling.] (Zo["o]l.)
An extensive group of worms which have the body covered
externally with vibrating cilia. It includes the
Rhabdoc[oe]la and Dendroc[oe]la. Formerly, the nemerteans
were also included in this group.