Definition of megatherioid in English:

megatherioid

(also megatheroid)

Pronunciation /ˌmɛɡəˈθɪərɪɔɪd/

adjective

rare
  • Of, relating to, or resembling a megatherium.

Origin

Mid 19th century (in an earlier sense). Originally from megathere + -oid; later remodelled after megatherium.