n.
Pronunciation: ˌ brän-t ə - ' so ̇ r- ə s
Variant: also bron · to · saur \ ' brän-t ə - ˌ so ̇ r \
Function: noun
Etymology: New Latin, from Greek bront ē thunder + sauros lizard; akin to Greek bremein to roar
Date: 1892
: any of a genus ( Apatosaurus syn. Brontosaurus ) of large sauropod dinosaurs of the Jurassic ― called also apatosaurus