protein-rich

The compound adjective "protein-rich" is a modern English formation, combining two distinct and ancient roots to describe a specific nutritional quality. The first element, "protein," originates from the Greek prōtos, meaning "first" or "primary," reflecting the 19th-century scientific understanding of proteins as fundamental, primary substances of life. The second element, "rich," stems from the Old English concept of power and abundance, evolving to broadly signify "having much of." The logical fusion of these morphemes creates a term that literally means "abundant in the primary substance," directly and transparently conveying its modern dietary meaning.

Structure: protein + rich - protein: From French protéine, from Greek prōteios (primary), from prōtos (first). A noun functioning as the primary substance being described. - rich: From Old English rīċe (powerful, wealthy), from Proto-Germanic rīkijaz. An adjective suffix indicating an abundance of the preceding noun.