protein

protein - noun

any of a large group of nitrogenous organic compounds that are essential constituents of living cells; consist of polymers of amino acids; essential in the diet of animals for growth and for repair of tissues; can be obtained from meat and eggs and milk and legumes

View spelling list ie and ei words: rulebreakers and learn about the word protein in the Spellzone English spelling course, Unit 21. The 'I' before 'e' rule – does it work?.