1. a large sauropod dinosaur of the Jurassic period, characterized by front legs longer than hind legs and a long neck
Usage: paleontology; often capitalized as a genus name (Brachiosaurus)

Examples

• The brachiosaur was one of the largest land animals ever to exist.
• Brachiosaurs used their long necks to reach vegetation high in the trees.
• The museum's skeleton of a brachiosaur stretched across the entire hall.
• Unlike most sauropods, the brachiosaur had front legs that were longer than its back legs.
• Children were fascinated by the life-sized model of a brachiosaur at the natural history exhibit.