Definitions of sirenian
  1. noun
    any of two families of large herbivorous aquatic mammals with paddle-shaped tails and flipper-like forelimbs and no hind limbs
    synonyms: sea cow, sirenian mammal
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    Trichechus manatus, manatee
    sirenian mammal of tropical coastal waters of America; the flat tail is rounded
    Dugong dugon, dugong
    sirenian tusked mammal found from eastern Africa to Australia; the flat tail is bilobate
    Hydrodamalis gigas, Steller's sea cow
    extinct large sirenian mammal formerly found near the Asiatic coast of the Bering Sea
    type of:
    aquatic mammal
    whales and dolphins; manatees and dugongs; walruses; seals
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