Ris"soid\, n. [NL. Rissoa, the typical genus ( fr. A. Risso, an Italian naturalist) + -oid.] (Zo["o]l.) Any one of very numerous species of small spiral gastropods of the genus Rissoa, or family Rissoid[ae], found both in fresh and salt water.
Webster's Revised Unabridged Dictionary, © 1996, 1998 MICRA, Inc.
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