Pronunciation: (rō'dē-um), [key]
a silvery-white metallic element of the platinum family, forming salts that give rose-colored solutions: used to electroplate microscopes and instrument parts to prevent corrosion. Symbol: Rh; at. wt.: 102.905; at. no.: 45; sp. gr.: 12.5 at 20°C.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.