Meaning & use
protein
A nutrient made of amino acids that builds and repairs body tissue and supports muscle growth.
See it in a sentence
Eggs, chicken, and beans are all good sources of protein for a balanced diet.
The biologist studied how a single protein folds into its functional three-dimensional shape.
A note on using this word
In biology, protein also names any of thousands of specific molecules, not just a dietary category.
Words with a similar meaning
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