(biology) A member of an order of mammals of Sirenia (first attested in French in Dominique Bouhours, Les entretiens d'Ariste et d'Eugène, 1671).
(biology) A member of a genus of aquaticsalamanders of the family Sirenidae (originally introduced by Linnaeus, 1766, for a genus of his reptiles), commonly used for all species subsumed under the family of Sirenidae.