1. any of two families of large herbivorous aquatic mammals with paddle-shaped tails and flipper-like forelimbs and no hind limbs; [syn: sea cow, sirenian mammal, sirenian]
WordNet (r) 3.0 (2006):
sirenian mammal
n 1: any of two families of large herbivorous aquatic mammals
with paddle-shaped tails and flipper-like forelimbs and no
hind limbs [syn: sea cow, sirenian mammal, sirenian]