brachiosaur Get Printable Handwriting Hear It! Say It! Write It! Learn It! Spelling Test Definition noun. a large dinosaur with long legs and a long neck. Example Sentence We saw a movie with a brachiosaur. More Example Sentences Kids learn about the brachiosaur in school. Synonyms dinosaur; sauropod Hear It! Say It! Write It! brachiosaur Switch to cursive Start Share with your friends: