lipids Get Printable Handwriting Hear It! Say It! Write It! Learn It! Spelling Test Definition plural noun. a group of organic compounds that store energy and make up cell membranes. Example Sentence The main biological functions of lipids include energy storage. More Example Sentences Many foods contain healthy lipids. Synonyms fats; oils; waxes Antonyms proteins Hear It! Say It! Write It! lipids Switch to cursive Start Share with your friends: