noun, plural Palladia [puh-ley-dee-uh] .
Also, Palladion [puh-ley-dee-on] . a statue of Athena, especially one on the citadel of Troy on which the safety of the city was supposed to depend.
(usually lowercase) anything believed to provide protection or safety; safeguard.

< Latin Palladium < Greek Palládion, noun use of neuter of Palládios of Pallas, equivalent to Pallad- (stem of Pallás) Pallas + -ios adj. suffix Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
palladium1 (pəˈleɪdɪəm)
a ductile malleable silvery-white element of the platinum metal group occurring principally in nickel-bearing ores: used as a hydrogenation catalyst and, alloyed with gold, in jewellery. Symbol: Pd; atomic no: 46; atomic wt: 106.42; valency: 2, 3, or 4; relative density: 1202; melting pt: 1555°C; boiling pt: 2964°C
[C19: named after the asteroid Pallas, at the time (1803) a recent discovery]

palladium2 (pəˈleɪdɪəm)
something believed to ensure protection; safeguard
[C17: after the Palladium]

Palladium (pəˈleɪdɪəm)
a statue of Pallas Athena, esp the one upon which the safety of Troy depended

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Word Origin & History

c.1600, "safeguard," originally (late 14c.) "sacred image of Pallas Athene," from L. palladium, from Gk. Palladion, neut. of Palladios "of Pallas." It stood in the citadel of Troy and the safety of the city was believed to depend on it. As the name of a metallic element,
it was coined 1803 by discoverer, William Hyde Wollaston (1766-1828), from Pallas, name of an asteroid discovered the previous year (by Ger. astronomer Olbers) and named for the goddess.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

palladium pal·la·di·um (pə-lā'dē-əm)
Symbol Pd
A soft ductile metallic element occurring naturally with platinum, especially in gold, nickel, and copper ores, and used as a catalyst in hydrogenation. Atomic number 46; atomic weight 106.4; melting point 1,555°C; boiling point 2,963°C; specific gravity 12.02 (20°C); valence 2, 3, 4.

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American Heritage
Science Dictionary
palladium   (pə-lā'dē-əm)  Pronunciation Key 
Symbol Pd
A malleable, ductile, grayish-white metallic element that occurs naturally with platinum. It is used as a catalyst in hydrogenation and in alloys for making electrical contacts and jewelry. Atomic number 46; atomic weight 106.4; melting point 1,552°C; boiling point 3,140°C; specific gravity 12.02 (20°C); valence 2, 3, 4. See Periodic Table.
The American Heritage® Science Dictionary
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