Sirenia sirene • sirenian · · · Info · Definitions · Characters · · Sirenia · · Text Latin · · Script 7 · · Length Definitions · · · (noun) an animal order including: manatees; dugongs; Steller's sea cow. Synonyms: order Sirenia. · · Noun Definition 1 Characters · · S latin capital letter s U+0053 a latin small letter a U+0061 e latin small letter e U+0065 i latin small letter i U+0069 n latin small letter n U+006E r latin small letter r U+0072