'Tethioidea' definitions:

Definition of 'Tethioidea'

From: GCIDE

Tethyodea \Te`thy*o"de*a\, n. pl. [NL., fr. Tethys + Gr. e'i^dos form.] (Zool.) A division of Tunicata including the common attached ascidians, both simple and compound. Called also Tethioidea. [1913 Webster]