grapefruits Get Printable Handwriting Hear It! Say It! Write It! Learn It! Spelling Test Definition noun. large round citrus fruit with a yellow or pinkish skin and a sour or bitter taste Example Sentence They ate grapefruits for breakfast. Synonyms citrus fruit; pomelo; shaddock Antonyms sweet fruit; apple; banana Hear It! Say It! Write It! grapefruits Switch to cursive Start Share with your friends: