‖Te′thy‐o″de‐a (?), n. pl. [NL., fr. Tethys + Gr. � form.] (Zoöl.) A division of Tunicata including the common attached ascidians, both simple and compound. Called also Tethioidea.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.