megalonychid
/ˌmɛɡələˈnʌɪkɪd/Palaeontology
adjective
Designating or relating to extinct ground sloths of the family Megalonychidae.
noun
A ground sloth of the family Megalonychidae.
Origin
1940s; earliest use found in Science. From scientific Latin Megalonychidae, family name, from Megalonych-, taken as stem (after ancient Greek ὄνυχ-, ὄνυξ) of Megalonyx + -idae.