Troch″o‐sphere (?), n. [Gr. � a wheel + sphere.] (Zoöl.) A young larval form of many annelids, mollusks, and bryozoans, in which a circle of cilia is developed around the anterior end.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.