Original: Brachiosaurus ( ) , meaning '' arm lizard '' , from the Greek brachion \/O/ meaning '' arm '' and sauros \/O/ meaning '' lizard '' , is a genus of sauropod dinosaur that lived during the Late Jurassic Period and possibly the Early Cretaceous Period .
Simplified: Brachiosaurus ( meaning '' Arm lizard '' ) was a herbivorous dinosaur genus that lived in the Late Jurassic period .