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palladium (n.1)

"a safeguard," c. 1600, originally (late 14c., Palladioun) "a sacred image of Pallas Athene," from Old French palladion, from Latin palladium, from Greek Palladion, noun use of neuter of Palladios "of Pallas." It stood in the citadel of Troy and the safety of the city was believed to depend on it. Related: Palladian.

palladium (n.2)

metallic element, coined 1803 by discoverer William Hyde Wollaston (1766-1828), from Pallas, the name given to an asteroid discovered the previous year (by German astronomer Olbers) and named for the goddess (see Pallas).

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Definitions of palladium from WordNet

palladium (n.)
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;
Synonyms: Pd / atomic number "
From wordnet.princeton.edu