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See sea cow.
[From New Latin Sīrēnia, order name, from Latin Sīrēn, Siren; see siren.]
(Animals) of, relating to, or belonging to the Sirenia, an order of aquatic herbivorous placental mammals having forelimbs modified as paddles, no hind limbs, and a horizontally flattened tail: contains only the dugong and manatees
(Animals) any animal belonging to the order Sirenia; a sea cow
si•re•ni•an(saɪˈri ni ən)
an aquatic, herbivorous mammal of the order Sirenia, including the manatee and dugong.
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|Noun||1.||sirenian - any of two families of large herbivorous aquatic mammals with paddle-shaped tails and flipper-like forelimbs and no hind limbs|
aquatic mammal - whales and dolphins; manatees and dugongs; walruses; seals
manatee, Trichechus manatus - sirenian mammal of tropical coastal waters of America; the flat tail is rounded
dugong, Dugong dugon - sirenian tusked mammal found from eastern Africa to Australia; the flat tail is bilobate