dolphins Get Printable Handwriting Rhymes Hear It! Say It! Write It! Learn It! Spelling Test Definition noun. a mammal that lives in the water. They look like large fish but they breathe air. They have teeth and a snout; related to porpoises and whales Example Sentence The dolphins followed the ship for hours. Synonyms mammal; related to porpoises; related to whales Antonyms shark Hear It! Say It! Write It! dolphins Switch to cursive Start Rhymes Two Syllable Rhymes (2) dolphins dolphins' Share with your friends: