One of the mysteries of the English language finally explained.
Chemistry. An oxyanion of rhenium, ReO₃ 2−; a compound containing this.
Mid 19th century (in an earlier sense). From classical Latin Rhēnus, the name of the River Rhine + -ite. In sense 1 in allusion to the name of Rheinbreitbach (formerly also Rheinbreitenbach) in Germany, where the mineral is found.
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