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Palladium - Dictionary Definition and Overview |
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Palladium : (noun)
1: 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 [syn: Pd, atomic
number 46]
Based on WordNet 2.0
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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.
Based on Webster's Revised Unabridged Dictionary
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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.
Based on Webster's Revised Unabridged Dictionary
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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.
Based on Webster's Revised Unabridged Dictionary (1913)
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