cumuli Get Printable Handwriting Hear It! Say It! Write It! Learn It! Spelling Test Definition plural noun. white fluffy clouds in the sky. Example Sentence We gazed at the cumuli. More Example Sentences Children pointed at the cumuli during recess. Synonyms clouds; fluffy clouds; billowy clouds Antonyms sun Hear It! Say It! Write It! cumuli Switch to cursive Start Share with your friends: