Your browser does not seem to support JavaScript. As a result, your viewing experience will be diminished, and you have been placed in read-only mode.
Please download a browser that supports JavaScript, or enable it if it's disabled (i.e. NoScript).
A rare element of the light platinum group, found associatedwith platinum ores, and isolated as a hard, brittle steel-gray metalwhich is very infusible. Symbol Ru. Atomic weight 103.5. Specificgravity 12.26. See Platinum metals, under Platinum.
Share your knowledge with the community
Browse our collection of 300,000+ community-written definitions
