from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A hard, durable, silvery-white metallic element that is used to form high-temperature alloys with platinum and is plated on other metals to produce a durable corrosion-resistant coating. Atomic number 45; atomic weight 102.905; melting point 1,966°C; boiling point 3,727°C; specific gravity 12.41; valence 2, 3, 4, 5, 6. See Table at element.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. a metallic chemical element (symbol Rh) with an atomic number of 45.

from the GNU version of the Collaborative International Dictionary of English

  • n. A rare element of the light platinum group. It is found in platinum ores, and obtained free as a white inert metal which it is very difficult to fuse. Symbol Rh. Atomic weight 104.1. Specific gravity 12.

from The Century Dictionary and Cyclopedia

  • n. Chemical symbol, Rh; atomic weight, 103 (Jörgensen). A metal discovered in the beginning of the nineteenth century by Wollaston, associated with palladium in the ore of platinum.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. a white hard metallic element that is one of the platinum group and is found in platinum ores; used in alloys with platinum


Greek rhodo-, rhodo- + -ium.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From Ancient Greek ῥόδον (rhodon, "rose"), because of the colour of its salts' solutions. (Wiktionary)



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