reptiles Get Printable Handwriting Hear It! Say It! Write It! Learn It! Spelling Test Definition noun. a coldblooded animal with a skeleton inside its body and dry scales or hard plates on its skin. Example Sentence Reptiles are cold blooded animals. Synonyms cold-blooded animal; skeleton; dry scales Antonyms warm-blooded animal Hear It! Say It! Write It! reptiles Switch to cursive Start Share with your friends: