‖To‐mop″te‐ris (?), n.(Zoöl.) A genus of transparent marine annelids which swim actively at the surface of the sea. They have deeply divided or forked finlike organs (parapodia). This genus is the type of the order, or suborder, Gymnocopa.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.