noun. ['ˈmæstəˌdɔn'] extinct elephant-like mammal that flourished worldwide from Miocene through Pleistocene times; differ from mammoths in the form of the molar teeth.
1. Noun, singular or mass Although smaller than a mammoth, the mastodon was about the same size as an African elephant. 2. Verb, base form Mammoth and mastodon ivories do not require this permit.
