american mastodon: mastodon of North America; in some classifications considered a mammoth rather than a mastodon
mastodon: extinct elephant-like mammal that flourished worldwide from Miocene through Pleistocene times; differ from mammoths in the form of the molar teeth
gabapentin: an anticonvulsant (trade name Neurontin) used to control some types of seizures in the treatment of epilepsy; also used to manage neuralgia caused by shingles