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mammoth a very large extinct mammal closely related to elephants. Mammoths were much bigger than elephants, and had shaggy black fur and long tusks that curved upward. Several kinds of mammoths lived in the Northern Hemisphere until the end of the last Ice Age. [1/2 definitions]
mastodon a very large extinct mammal. Several kinds of mastodons lived in Africa, Europe, Asia, and North America tens of thousands of years ago. The last kind of mastodon became extinct at the end of the last Ice Age. Mammoths and modern elephants may have developed from earlier mastodons.