Megalonyx
Pronunciation : Meg`a*lon"yx
Part of Speech : n.
Etymology : [NL., from Gr. me`gas, mega`lh, great + 'o`nyx claw.] (Paleon.)
Definition : Defn: An extinct quaternary mammal, of great size, allied to the sloth.
Source : Webster's Unabridged Dictionary, 1913