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Definition of Ru
1. Noun. A rare polyvalent metallic element of the platinum group; it is found associated with platinum. 
Medical Definition of Ru
1. Symbol for ruthenium. (05 Mar 2000)
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1. Noun. A rare polyvalent metallic element of the platinum group; it is found associated with platinum. 
1. Symbol for ruthenium. (05 Mar 2000)