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单词 palladium
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palladium

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palladium in British English 1

(pəˈleɪdɪəm)
noun
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
Word origin
C19: named after the asteroid Pallas, at the time (1803) a recent discovery

palladium in British English 2

(pəˈleɪdɪəm)
noun
something believed to ensure protection; safeguard
Word origin
C17: after the Palladium

Palladium in British English

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

Palladium in American English

(pəˈleɪdiəm)
nounWord forms: plural Palˈladia (pəˈleɪdiə)
1. 
in ancient Greece and Rome, any statue of the Greek goddess Pallas Athena; specif., the legendary statue in Troy on the preservation of which the safety of the city was supposed to depend
2.  [p-]
anything supposed to ensure the safety of something; safeguard
Word origin
L < Gr palladion, sacred statue or image, after Pallas

palladium in American English

(pəˈleɪdiəm)
noun
a rare, silver-white, ductile, malleable chemical element, one of the platinum metals: itis used as a catalyst, esp. in hydrogenation processes, or in alloys with gold, silver, and other metals: symbol, Pd; at. no., 46
Word origin
ModL: so named (1803) by W. H. Wollaston (see wollastonite), after the recently discovered asteroid Pallas + -ium

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palladium

chemical
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更新时间：2025/1/24 16:42:08