1. a large plant-eating dinosaur with a very long neck and tail that lived during the late Jurassic period
Usage: paleontology

Examples

• The diplodocus was one of the longest dinosaurs ever discovered.
• Children love seeing the diplodocus skeleton at the natural history museum.
• A diplodocus could grow up to 90 feet in length.
• The diplodocus used its long neck to reach high vegetation.
• Fossils of diplodocus have been found in the western United States.
• The diplodocus had a whip-like tail that it may have used for defense.