catheters Get Printable Handwriting Hear It! Say It! Write It! Learn It! Spelling Test Definition plural noun. tubes used to deliver fluids into the body or remove fluids from it. Example Sentence The nurse cleaned the patients' catheters. More Example Sentences Patients may need catheters for treatment. Synonyms tubes; medical devices; drainage tubes Antonyms fluid Hear It! Say It! Write It! catheters Switch to cursive Start Share with your friends: