palladium

¹

[puh-ley-dee-uhm]

noun

Chemistry.

1. a rare metallic element of the platinum group, silver-white, ductile and malleable, harder and fusing more readily than platinum: used chiefly as a catalyst and in dental and other alloys. Pd; 106.4; 46; 12 at 20°C.

Palladium

²

[puh-ley-dee-uhm]

noun

plural

Palladia 

1. Also Palladion a statue of Athena, especially one on the citadel of Troy on which the safety of the city was supposed to depend.

2. (usually lowercase),  anything believed to provide protection or safety; safeguard.

palladium

¹

/ pəˈleɪdɪəm /

noun

1. 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

palladium

²

/ pəˈleɪdɪəm /

noun

1. something believed to ensure protection; safeguard

Palladium

³

/ pəˈleɪdɪəm /

noun

1. a statue of Pallas Athena, esp the one upon which the safety of Troy depended

palladium

1. 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.

2. See Periodic Table

Word History and Origins

Origin of palladium¹

Special use of Palladium; named (1803) after the asteroid Pallas, then newly discovered; -ium

Origin of palladium²

< Latin Palladium < Greek Palládion, noun use of neuter of Palládios of Pallas, equivalent to Pallad- (stem of Pallás ) Pallas + -ios adj. suffix

Word History and Origins

Origin of palladium¹

C19: named after the asteroid _Pallas , at the time (1803) a recent discovery

Origin of palladium²

C17: after the _Palladium

Example Sentences

Similar to traditional palladium-based catalysis, the behavior of photoexcited palladium catalysts is highly dependent on the phosphine ligand attached to the metal.

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Any coin issued under the laws of any state or any gold, silver, platinum or palladium bullion of a certain fineness, if a trustee keeps physical possession of it, are not included.

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Catalytic converter theft is a growing problem in Southern California, as thieves target the emission-control devices for high-value metals such as platinum, palladium and rhodium.

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Thieves target catalytic converters because they contain precious metals, including rhodium, palladium and platinum.

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Thieves target catalytic converters because they contain precious metals including rhodium, palladium and platinum.

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