Rissoid
Pronunciation : Ris"soid
Part of Speech : n.
Etymology : [NL. Rissoa, the typical genus ( fr. A.Risso, an Italian naturalist) + -oid.] (Zo?l.)
Definition : Defn: Any one of very numerous species of small spiral gastropods of the genus Rissoa, or family Rissoid?, found both in fresh and salt water.
Source : Webster's Unabridged Dictionary, 1913