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Guillaume François Rouelle (1703-1770) was a French chemist and apothecary. He is known as l'Aîné (the elder) to distinguish him from his younger brother, Hilaire Rouelle, who was also a chemist and is known as the discoverer of urea.
He started a public course in his laboratory in 1738 where he taught many students among whom were Denis Diderot, Antoine-Laurent de Lavoisier and Antoine A. Parmentier.