Definition of Protein 1. Any of a large group of nitrogenous organic compounds that are essential constituents of living cells; consist of polymers of amino acids; essential in the diet of animals for growth and for repair of tissues; can be obtained from meat and eggs and milk and legumes Noun Semanticaly linked words with "protein" Hyponims for word "protein" Lexical Analysis for "protein" proteinaceous relating to or of the nature of protein etymology bioprotein etymology chromoprotein etymology deproteinize etymology ectoprotein etymology fetoprotein etymology glycoprotein etymology hemiprotein etymology holoprotein etymology immunoprotein etymology interprotein etymology isoprotein etymology metaprotein etymology multiprotein etymology mycoprotein etymology myoprotein etymology neuroprotein etymology nucleoprotein etymology paraprotein etymology proteinless etymology proteinlike etymology proteinomics etymology proteome etymology proteomics etymology protomer etymology seroprotein etymology xanthoprotein is derived from green fluorescent protein is derived from proteinic is derived from proteinous is derived from proteins