"palladium" in the noun sense
1. palladium, Pd, atomic number 46
a silver-white metallic element of the platinum group that resembles platinum occurs in some copper and nickel ores does not tarnish at ordinary temperatures and is used (alloyed with gold) in jewelry
Source: WordNet® (An amazing lexical database of English)
Princeton University "About WordNet®."
WordNet®. Princeton University. 2010.
View WordNet® License