Arginine

Part of speech: noun

Definitions

1. An amino acid considered essential for protein synthesis and plays a crucial role in metabolic processes and the production of nitric oxide
2. This naturally occurring compound is integral for the proper functioning of several body systems, aiding in detoxification and tissue repair
3. It serves as a precursor for various important substances, contributing to immune function and hormone regulation in the body

Etymology: Arginine was named for silver. In 1886, the German chemists Ernst Schulze and Ernst Steiger were refining the compound from lupin seedlings, and the crystals of its nitrate salt came out silver-white and brightly shining. That visual detail gave the substance its name, drawn from the Ancient Greek "árguros", meaning "silver", and the related adjective "arginóeis", meaning "silvery" or "brightly shining". The name passed to English through German "Arginin", which was coined on the same Greek root. The chemists were not naming the amino acid by its chemistry or its biological role, which came to matter far more later. They were describing what the crystals looked like in the flask.