Definition of "megatherium" [megatherium]

• The typical genus of the family Megatheriidæ, containing huge extinct sloths larger than a rhinoceros. (noun)
• [lowercase] An animal of this genus. (noun)

The Century Dictionary (Public Domain)

• "We are more surprised by finding such gigantic proportions in an animal called the megatherium, which ranks in an order now assuming much humbler forms -- the edentata -- to which the sloth, ant-eater, and armadillo belong."
• "He called Josep Maria Cruxent who identified it as being from a megatherium, a mammal from the Pleistocene, and 25 million years old."
• "I'll walk across it myself tomorrow en route to seeing Darwin's fossil megatherium."