noun
mastodon
Refers to the extinct elephant-like mammal. Also used for the social media platform, but that sense is not.
博物館でマストドンの化石を見た。
I saw a mastodon fossil at the museum.
Borrowed from English 'mastodon', ultimately from Greek 'mastos' (breast) and 'odous' (tooth), referring to the nipple-shaped cusps on its molars.