a plant-eating sauropod dinosaur of the genus Camarasaurus and closely related genera, having a small head, long neck, and short forelimbs, and reaching a length of 40 feet (12.2 meters); until 1981 the type specimen of Brontosaurus excelcus was wrongly reconstructed with a Camarasaurus skull.

Origin of camarasaur

< New Latin Camarasaurus (1877), irregular < Greek kamára space enclosed by an arch, vault (cf. chamber) + -saurus -saur Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019