Thanks for using this online dictionary, we have been helping millions of people improve their use of the english language with its free online services. English definition of megalonyx is as below...

Megatheroid :: Megatheroid (n.) One of a family of extinct edentates found in America. The family includes the megatherium, the megalonyx, etc..

Megalonyx :: Megalonyx (n.) An extinct quaternary mammal, of great size, allied to the sloth..

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