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Noun1.megatheriid - a large extinct ground slothmegatheriid - a large extinct ground sloth  
edentate - primitive terrestrial mammal with few if any teeth; of tropical Central America and South America
family Megatheriidae, Megatheriidae - extinct ground sloths
ground sloth, megathere - gigantic extinct terrestrial sloth-like mammal of the Pliocene and Pleistocene in America
References in periodicals archive ?
1995: Eremotherium laurillardi: The Panamerican late Pleistocene megatheriid ground sloth.
Identification of plant fragments in dung balls associated with the extinct North American megatheriid sloth Nothrotheriops shastensis determined the browsing diet of that taxon in northern Arizona (Hansen 1978).