1. An extinct gigantic quadruped of S. America.

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin

• negatherium,
• kegatherium,
• jegatherium,
• mwgatherium,
• msgatherium,
• mdgatherium,
• mrgatherium,
• m4gatherium,
• m3gatherium,
• mefatherium,
• mevatherium,
• mebatherium,
• mehatherium,
• metatherium,
• megatheriun,
• megatherim,
• megaethrium,
• megalherium,
• megathirium,
• megretherium

• megathere,
• megatheriid,
• megatheriidae,
• megatherian,
• megaderma.

The adjective form of the word "megatherium" is "megatherian".

The plural of the "megatherium" can be the "megatheria".

The singular of the "megatherium" can be the "megatherium".