| 单词 | praseodymium |
| 释义 | praseodymium[ prey-zee-oh-dim-ee-uhm, prey-see- ] / ˌpreɪ zi oʊˈdɪm i əm, ˌpreɪ si- / noun Chemistry.a rare-earth, metallic, trivalent element, named from its green salts. Symbol: Pr; atomic weight: 140.91; atomic number: 59; specific gravity: 6.77 at 20°C. Origin of praseodymium1880–85; <New Latin, equivalent to praseo- (combining form representing Greek prásios leek-green; see prase) + (di)dymium Words nearby praseodymiumprankster, pranky, prao, Prasad, prase, praseodymium, prat, Pratchett, prate, pratfall, pratincole Dictionary.com UnabridgedBased on the Random House Unabridged Dictionary, © Random House, Inc. 2020 Example sentences from the Web for praseodymium
British Dictionary definitions for praseodymiumpraseodymium / (ˌpreɪzɪəʊˈdɪmɪəm) / nouna malleable ductile silvery-white element of the lanthanide series of metals. It occurs principally in monazite and bastnaesite and is used with other rare earths in carbon-arc lights and as a pigment in glass. Symbol: Pr; atomic no: 59; atomic wt: 140.90765; valency: 3; relative density: 6.773; melting pt: 931°C; boiling pt: 3520°C Word Origin for praseodymiumC20: New Latin, from Greek prasios of a leek-green colour + didymium Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012 Medical definitions for praseodymiumpraseodymium [ prā′zē-ō-dĭm′ē-əm, prā′sē- ] n. Symbol PrA soft malleable ductile rare-earth element that develops a characteristic green tarnish in air and is used to color glass and ceramics yellow and in metallic alloy. Atomic number 59. The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company. Scientific definitions for praseodymiumpraseodymium [ prā′zē-ō-dĭm′ē-əm ] PrA soft, malleable, silvery metallic element of the lanthanide series that develops a green tarnish in air. It is used to add a yellow tint to glass and ceramics and to make the glass used in welding goggles. Atomic number 59; atomic weight 140.908; melting point 935°C; boiling point 3,127°C; specific gravity 6.8; valence 3, 4. See Periodic Table. The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved. |
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