WordReference Random House Unabridged Dictionary of American English © 2026
bra•chi•o•saur
(brā′kē ə sôr′, brak′ē-),USA pronunciation n.
- Paleontologya huge sauropod dinosaur of the genus Brachiosaurus, having a small head with nostrils on a knob above the eyes, long forelegs, and a sloping, massive body, and reaching a length of about 80 ft. (24 m).
- Neo-Latin Brachiosaurus (1903); see brachio-, -saur; so named in allusion to the unusual length of the humerus relative to the femur