cylinders Get Printable Handwriting Hear It! Say It! Write It! Learn It! Spelling Test Definition plural noun. three-dimensional shapes with circular bases and straight sides. Example Sentence The cylinders in the engine help it run smoothly. More Example Sentences We learned about cylinders in math class. Synonyms tubes; pipes; drums Antonyms spheres; cubes Hear It! Say It! Write It! cylinders Switch to cursive Start Share with your friends: