- any of several plant-eating aquatic mammals of the genus Trichechus, of West Indian, Floridian, and Gulf Coast waters, having two flippers in front and a broad, spoon-shaped tail: all species are endangered.
- any sirenian mammal of the genus Trichechus, occurring in tropical coastal waters of America, the Caribbean, and Africa: family Trichechidae. They resemble whales and have a prehensile upper lip and a broad flattened tail
