Ris"soid, n. Etym: [NL. Rissoa, the typical genus ( fr. A.Risso, an Italian naturalist) + -oid.] (Zoöl.)
Definition: Any one of very numerous species of small spiral gastropods of the genus Rissoa, or family Rissoidæ, found both in fresh and salt water.
Source: Webster’s Unabridged Dictionary 1913 Edition
5 July 2025
(noun) the process of introducing an acetyl group into a compound; “the acetylation of cyclooxygenase-2 by aspirin”
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