| 释义 |
WordReference Random House Unabridged Dictionary of American English © 2024pal•la•di•um (pə lā′dē əm),USA pronunciation n. [Chem.]- Chemistrya 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. Symbol: Pd;
at. wt.: 106.4;
at. no.: 46;
sp. gr.: 12 at 20°C.
- special use of Palladium; named (1803) after the asteroid Pallas, then newly discovered; see -ium
(-dē ə).USA pronunciation Also, Pal•la•di•on (pə lā′dē on′).USA pronunciation a statue of Athena, esp. one on the citadel of Troy on which the safety of the city was supposed to depend.- (usually l.c.) anything believed to provide protection or safety;
safeguard. - Greek Palládion, noun, nominal use of neuter of Palládios of Pallas, equivalent. to Pallad- (stem of Pallás) Pallas + -ios adjective, adjectival suffix
- Latin Palladium
Collins Concise English Dictionary © HarperCollins Publishers:: palladium /pəˈleɪdɪəm/ n - 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
Etymology: 19th Century: named after the asteroid Pallas, at the time (1803) a recent discovery palladium /pəˈleɪdɪəm/ n - something believed to ensure protection; safeguard
Etymology: 17th Century: after the Palladium Collins Concise English Dictionary © HarperCollins Publishers:: Palladium /pəˈleɪdɪəm/ n - a statue of Pallas Athena, esp the one upon which the safety of Troy depended
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