from The Century Dictionary.
- noun An extinct terrestrial edentate mammal of a group represented by the megatherium and its allies, from some member of which the modern arboreal sloths are supposed to be descended; one of the family Megatheriidœ in a broad sense.
Sorry, no etymologies found.
Which considering I have the sartorial skill of a three toed, color-blind ground-sloth, I was very impressed by.
Doubtless with its sharp, retractile claws it hung onto the huge bodies of elephant, camel, and ground-sloth, of horse and bison, while the sabres were driven again and again into the mortal parts of the prey and slashed the flesh as they withdrew.