hydrants Get Printable Handwriting Hear It! Say It! Write It! Learn It! Spelling Test Definition noun. a large discharge pipe with a valve for drawing water from a water main; Example Sentence The city has increased the amount of hydrants on main street. Synonyms water supply; fireplug; spigot; faucet Antonyms fire Hear It! Say It! Write It! hydrants Switch to cursive Start Share with your friends: