giganotosaurus Get Printable Handwriting Hear It! Say It! Write It! Learn It! Spelling Test Definition noun. a large dinosaur that lived in the late cretaceous period. Example Sentence A giganotosaurus was larger than a tyrannosaurus. More Example Sentences It had sharp teeth and long legs. Synonyms dinosaur; theropod; predator Antonyms ant Hear It! Say It! Write It! giganotosaurus Switch to cursive Start Share with your friends: