Longman Dictionary English From Longman Dictionary of Contemporary EnglishRelated topics: Animalsbrontosaurusbron‧to‧sau‧rus /ˌbrɒntəˈsɔːrəs $ ˌbrɑːn-/ noun [countable] HBAa large dinosaur with a small head and a long neckOrigin brontosaurus (1800-1900) Greek bronte “thunder” + sauros “lizard” ldoceonline.com