Turbellaria \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.

Source: Webster's Revised Unabridged Dictionary (1913)