pro ‧ tein /ˈprəʊtiːn $ ˈproʊ-/ BrE AmE noun [uncountable and countable]
[ Date: 1800-1900 ; Language: French ; Origin: protéine , from Greek protos 'first' ]
one of several natural substances that exist in food such as meat, eggs, and beans, and which your body needs in order to grow and remain strong and healthy