SireniaSi*re"ni*a\, n. pl. [NL.] (Zo["o]l.) An order of large aquatic herbivorous mammals, including the manatee, dugong, rytina, and several fossil genera. Note: The hind limbs are either rudimentary or wanting, and the front ones are changed to paddles. They have horny plates on the front part of the jaws, and usually flat-crowned molar teeth. The stomach is complex and the intestine long, as in other herbivorous mammals. See Cetacea (b) .
|an animal order including: manatees; dugongs; Steller's sea cow|