extinct genus of gigantic mammals, 1877, Modern Latin, from Greek brontē "thunder" (probably imitative) + Greek thērion "beast, wild beast, hunted animal" (from PIE root *ghwer- "wild beast").
Entries linking to brontothere
*ghwer-
Proto-Indo-European root meaning "wild beast."
It forms all or part of: baluchitherium; feral; ferine; ferocious; ferocity; fierce; ther-; Theropoda; treacle.
It is the hypothetical source of/evidence for its existence is provided by: Latin ferus "wild, untamed;" Greek thēr, Old Church Slavonic zveri, Lithuanian žvėris "wild beast."