sirenian(n = noun.animal) sea cow, sirenian mammal - any of two families of large herbivorous aquatic mammals with paddle-shaped tails and flipper-like forelimbs and no hind limbs;
is a kind of aquatic mammal
is a member of order sirenia, sirenia
has particulars: manatee, trichechus manatus, dugong, dugong dugon, hydrodamalis gigas, steller's sea cow
Any species of Sirenia. [1913 Webster]
sirenian, adj. & n.
--adj. of the order Sirenia of large aquatic plant-eating mammals, e.g. the manatee and dugong.
--n. any mammal of this order.
Etymology:
mod.L Sirenia (as SIREN)