- noun a rare heavy metallic element with a high melting point, used as a catalyst with tungsten in thermocouples
- A silver-white or gray metallic chemical element whose atomic number is 75. Among the elements, its melting point is exceeded only by carbon and tungsten, and its density is greater than all but iridium, osmium, and platinum. It has over 30 known isotopes, of which one is stable. It has various applications in electronics, including its use in filaments, contacts, high-temperature thermocouples, flashbulbs, electroplating, semiconductors, and superconductors. Its chemical symbol is Re.
- chemical symbol Re
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