Definition of protein noun from the Oxford Advanced Learner's Dictionary

 

protein

 noun
noun
BrE BrE//ˈprəʊtiːn//
 
; NAmE NAmE//ˈproʊtiːn//
 
[countable, uncountable] Diet, Cell biology
 
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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. see also enzyme Wordfinderbiology, biotechnology, breed, cell, chromosome, DNA, gene, mutation, organism, protein See related entries: Diet, Cell biology Word Origin mid 19th cent.: from French protéine, German Protein, from Greek prōteios ‘primary’, from prōtos ‘first’.
See the Oxford Advanced American Dictionary entry: protein

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