Definition of protein noun from the Oxford Advanced American Dictionary

 

protein

 noun
noun
NAmE//ˈproʊtin//
 
[countable, uncountable]
 
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a natural substance found in meat, eggs, fish, some vegetables, 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.
See the Oxford Advanced Learner's Dictionary entry: protein

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