hippopotamus
Definition
A massive, semi-aquatic mammal (Hippopotamus amphibius) native to sub-Saharan Africa, characterized by a barrel-shaped torso, short legs, a wide mouth, and thick, grayish skin; known for its aggressive temperament despite a mostly herbivorous diet.
Any of several similar large river-dwelling mammals in the family Hippopotamidae, such as the pygmy hippopotamus.
Examples
The hippopotamus lounged in the river like a grumpy waterbed, eyeing passersby with mild disdain.
Despite its name meaning 'river horse,' the hippopotamus waddles more like an offended sofa on vacation.
At the safari, the guide warned that the hippopotamus yawns are basically nature's way of saying 'back off or become lunch.'
My uncle's appetite rivals that of a hippopotamus—family dinners require industrial quantities of pasta.