mastodon
/ˈmæstədɒn/noun
1- a large extinct elephant-like mammal of the Miocene to Pleistocene epochs, having teeth of a relatively primitive form and number柱牙象, 乳齿象。
1.1
- Mammutidae and other families, order Proboscidea: many species, including Mammut americanus, which possibly survived to historical times in North America.乳齿象科和其他科, 长鼻目：多种, 其中美洲乳齿象（拉丁名Mammut americanus）可能在北美洲一直存活到有历史记载的时期。
词源
early 19th cent.: modern Latin, from Greek mastos 'breast' + odous, odont- 'tooth' （with reference to nipple-shaped tubercles on the crowns of its molar teeth）.