noun.
Any of various herbivorous aquatic mammals of the genus Trichechus, having paddlelike front flippers and a horizontally flattened tail and found in warm coastal waters of Florida, northern South America, West Africa, and the Caribbean.
The Century Dictionary and Cyclopedia
noun.
A sea-cow; a gregarious herbivorous aquatic sirenian mammal, of the genus Manatus, family Manatidœ, and order Sirenia.
the GNU version of the Collaborative International Dictionary of English
noun.
Any species of Trichechus, a genus of sirenians; -- called also sea cow.