siphons Get Printable Handwriting Hear It! Say It! Write It! Learn It! Spelling Test Definition noun. a tube or pipe used to suck a liquid over the top of its container and into a lower one by means of air pressure;verb. to convey draw or pass through Example Sentence He siphons half the water out of the fish tank to clean it. Synonyms drain; funnel; pump; tube Antonyms fill up Hear It! Say It! Write It! siphons Switch to cursive Start Share with your friends: