Grade 6 dinosaurs Get Printable Handwriting Hear It! Say It! Write It! Learn It! Spelling Test Definition plural noun. large reptiles that lived millions of years ago. Example Sentence Dinosaurs are extinct. More Example Sentences They were the largest animals of their time. Synonyms reptiles; ancient creatures; giants Antonyms kitten Hear It! Say It! Write It! dinosaurs Switch to cursive Start Share with your friends: