A large, extinct, elephant-like mammal of the genus Mammut, which lived from the Miocene to the Pleistocene epochs, characterized by long, curved tusks and a covering of long hair.

The paleontologists were thrilled to discover the fossilized remains of a mastodon in the riverbed.

Something that is very large, old-fashioned, or obsolete.

The mainframe computer was a mastodon compared to today's sleek laptops.

mastodonadjective

Relating to, derived from, or characteristic of mastodons.

The excavation uncovered mastodon teeth alongside fossilized bison bones.