ˌ ̷ ̷ ̷ ̷ˌdänˈsȯrəs noun
Usage: capitalized
Etymology: New Latin, from Mastodon + -saurus
: a genus of Old World Triassic amphibians containing the largest known labyrinthodonts with the skull over four feet long and having at the front of the lower jaw a pair of short tusks that close into openings piercing the premaxillae