mammoth n
1 any large extinct elephant of the Pleistocene genus Mammuthus (or Elephas), such as M. primigenius (woolly mammoth), having a hairy coat and long curved tusks adj
2 of gigantic size or importance
(C18: from Russian mamot, from Tartar mamont, perhaps from mamma earth, because of a belief that the animal made burrows)
Mammoth Cave National Park n
a national park in W central Kentucky: established in 1941 to protect a system of limestone caverns