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palladium |
4 definitions found From Webster's Revised Unabridged Dictionary (1913) [web1913]: Palladium \Pal*la"di*um\, n. [L., fr Gr ?, fr ?, ?, Pallas.] 1. (Gr. Antiq.) Any statue of the goddess Pallas; esp., the famous statue on the preservation of which depended the safety of ancient Troy. 2. Hence: That which affords effectual protection or security; a sateguard; as the trial by jury is the palladium of our civil rights. --Blackstone. From Webster's Revised Unabridged Dictionary (1913) [web1913]: Palladium \Pal*la"di*um\, n. [NL.] (Chem.) A rare metallic element of the light platinum group found native, and also alloyed with platinum and gold. It is a silver-white metal resembling platinum, and like it permanent and untarnished in the air, but is more easily fusible. It is unique in its power of occluding hydrogen, which it does to the extent of nearly a thousand volumes, forming the alloy {Pd2H}. It is used for graduated circles and verniers, for plating certain silver goods, and somewhat in dentistry. It was so named in 1804 by Wollaston from the asteroid Pallas, which was discovered in 1802. Symbol Pd Atomic weight, 106.2. From WordNet r 1.6 [wn]: palladium n : a sliver-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 [syn: {Pd}, {atomic number 46}] From Elements database 20001107 [elements]: palladium Symbol: Pd Atomic number: 46 Atomic weight: 106.4 Soft white ductile transition element. Found with some copper and nickel ores. Does not react with oxygen at normal temperatures. Dissolves slowly in hydrochloric acid. Discovered in 1803 by W.H. Wollaston.
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