TURBELLARIA

Turbellaria, class Turbellaria

(noun) free-living flatworms

Source: WordNet® 3.1

Tur`bel*la"ri*a, n.; pl. Etym: [NL., dim. fr. L. turbo a whirling.] (Zoöl.)

Definition: An extensive group of worms which have the body covered externally with vibrating cilia. It includes the Rhabdocoela and Dendrocoela. Formerly, the nemerteans were also included in this group.

Source: Webster’s Unabridged Dictionary 1913 Edition