palladium
Concise Oxford English Dictionary © 2008 Oxford University Press:
palladium1 /pəˈleɪdɪəm/
▶noun the chemical element of atomic number 46, a rare silvery-white metal resembling platinum. (Symbol: Pd)
– origin C19: mod. L., from Pallas, an asteroid discovered (1803) just before the element.
Concise Oxford English Dictionary © 2008 Oxford University Press:
palladium2 /pəˈleɪdɪəm/
▶noun (pl. palladia /-dɪə/) archaic a safeguard or source of protection.
– origin ME: via L. from Gk palladion, denoting an image of the goddess Pallas (Athene), on which the safety of Troy was believed to depend.
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