Definition of brontosaurus
: any of a genus (Apatosaurus) of very large sauropod dinosaurs of the Late Jurassic : apatosaurus ◆The name brontosaurus continues to be commonly used for these dinosaurs even though their former genus name (Brontosaurus) is considered invalid.
Origin and Etymology of brontosaurus
New Latin, from Greek brontē thunder + sauros lizard; akin to Greek bremein to roar
First Known Use: 1883
BRONTOSAURUS Defined for English Language Learners
Definition of brontosaurus for English Language Learners
: a very large dinosaur that had a long neck and tail
BRONTOSAURUS Defined for Kids
Definition of brontosaurus for Students
: a huge plant-eating dinosaur with a long neck and tail and four thick legs
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