a rare, metallic chemical element that is a silver-white solid or a gray-to-black powder, used in thermocouples, electrodes, etc.: symbol, Re; at. no., 75 see the periodic table of elements in the Reference Supplement
Webster’s New World College Dictionary, Fourth Edition, compiled by the
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Word origin of 'rhenium'
ModL < L Rhenus,
Rhine + -ium
: so named (1925) by its discoverers W. Noddack (1893-1960), I. Tacke, & O. Berg,