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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
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References in periodicals archive ?
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).