Definition of Risoid

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Definition of Risoid

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.

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.

- Webster's Unabridged Dictionary (1913)

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