protein
Any of numerous large, complex naturally-produced molecules composed of one or more long chains of amino acids, in which the amino acid groups are held together by peptide bonds.
Other meanings
One of three major classes of food or source of food energy (4 kcal/gram) abundant in animal-derived foods meat and some vegetables, such as legumes.
A food rich in protein, often a meat or meat substitute.
Example sentences
Word history
From Ancient Greek "πρωτεῖος" (primary).
Where this comes from
This definition is adapted from “protein” on Wiktionary, by its contributors; example sentences are from Tatoeba, credited to their authors above, published under CC BY-SA 4.0. This page is published under the same licence.