two-year-old Get Printable Handwriting Hear It! Say It! Write It! Learn It! Spelling Test Definition adjective. two years of age;noun. a racehorse that is two years old Example Sentence Her sister is a whiny two-year-old. Synonyms 2 years of age; 2 years old; 2 Antonyms 30 years old Hear It! Say It! Write It! two-year-old Switch to cursive Start Share with your friends: