life buoy Get Printable Handwriting Hear It! Say It! Write It! Learn It! Spelling Test Definition noun. a floating device that helps save lives in water. Example Sentence He threw a life buoy to the struggling swimmer. More Example Sentences A life buoy can save a person's life. Synonyms lifesaver; float; rescue ring Hear It! Say It! Write It! life buoy Switch to cursive Start Share with your friends: