| ruthenium | <chemistry, element> A rare element of the light platinum group, found associated with platinum ores, and isolated as a hard, brittle steel-gray metal which is very infusible. Specific gravity 12.26. See Platinum metals, under Platinum. Atomic weight: 103.5 Abbreviation: Ru Origin: NL. So named from the Ruthenians, a Little Russian people, as coming from Russia, the metal having been found in the Ural mountains. (30 Mar 1998) |
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| ruthenium compounds | Inorganic compounds that contain ruthenium as an integral part of the molecule. (12 Dec 1998) |
| ruthenium radioisotopes | Unstable isotopes of ruthenium that decay or disintegrate emitting radiation. Ru atoms with atomic weights 93-95, 97, 103, and 105-108 are radioactive ruthenium isotopes. (12 Dec 1998) |
| ruthenium red | <chemical> A stain used in electron microscopy for acid mucopolysaccharides on the outer surfaces of cells. (17 Dec 1997) |