protein noun definition in Diet topic from the Oxford Advanced Learner's Dictionary


 noun: Diet topic
a substance, found within all living things, that forms the structure of muscles, organs, etc. There are many different proteins and they are an essential part of what humans and animals eat to help them grow and stay healthy. essential proteins and vitamins protein deficiency Peas, beans and lentils are a good source of vegetable protein. Gluten is a protein found in wheat and other grains.