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Definition of Rissoid
1. n. Any one of very numerous species of small spiral gastropods of the genus Rissoa, or family Rissoidæ, found both in fresh and salt water.
Definition of Rissoid
1. Noun. (zoology) Any of the spiral gastropods of the genus ''Rissoa'' or family Rissoidae, found both in fresh and salt water. ¹
¹ Source: wiktionary.com
Medical Definition of Rissoid
1.