sirenian mammal is a noun meaning "any of two families of large herbivorous aquatic mammals with paddle-shaped tails and flipper-like forelimbs and no hind limbs". It carries one recorded sense.
any of two families of large herbivorous aquatic mammals with paddle-shaped tails and flipper-like forelimbs and no hind limbs
Definitions, synonyms and semantic relations for sirenian mammal come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.