Ris″soid (?), n. [NL. Rissoa, the typical genus (fr. A. Risso, an Italian naturalist) + -oid.] (Zoöl.) Any one of very numerous species of small spiral gastropods of the genus Rissoa, or family Rissoidæ, found both in fresh and salt water.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.