Claude Joseph Geoffroy
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Claude Joseph Geoffroy (1685–1752), was the brother of Étienne François Geoffroy.
Like his brother, he was an apothecary and chemist. Having a considerable knowledge of botany, he devoted himself especially to the study of the essential oils in plants.
He is known as Geoffroy the Younger to distinguish him from his brother, Geoffroy the Elder. However, this leads to confusion with his contemporary Claude François Geoffroy (1729–1753) who is known as "Claude Geoffroy the Younger".