radium
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ra·di·um
(rā′dē-əm)n. Symbol Ra
A rare, brilliant white, luminescent, highly radioactive metallic element found in very small amounts in uranium ores, having more than 40 isotopes and isomers with mass numbers between 201 and 234, of which Ra-226 with a half-life of 1,600 years is the most common. It is used as a neutron source for some research purposes and was formerly widely used in cancer radiotherapy and as a constituent of luminescent paints. Atomic number 88; melting point 696°C; boiling point 1,737°C; specific gravity 5; valence 2. See Periodic Table.
[Latin radius, ray; see ray1 + -ium.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
radium
(ˈreɪdɪəm)n
(Elements & Compounds)
a. a highly radioactive luminescent white element of the alkaline earth group of metals. It occurs in pitchblende, carnotite, and other uranium ores, and is used in radiotherapy and in luminous paints. Symbol: Ra; atomic no: 88; half-life of most stable isotope, 226Ra: 1620 years; valency: 2; relative density: 5; melting pt: 700°C; boiling pt: 1140°C
b. (as modifier): radium needle.
[C20: from Latin radius ray]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
ra•di•um
(ˈreɪ di əm)n.
a highly radioactive metallic element whose decay yields radon gas and alpha rays. Symbol: Ra; at. wt.: 226; at. no.: 88.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
ra·di·um
(rā′dē-əm) Symbol Ra A rare, bright-white, highly radioactive element that is an alkaline-earth metal and gives off its own light. It occurs naturally in very small amounts in ores and minerals containing uranium. Radium is used as a source of radon gas for the treatment of disease and as a neutron source for scientific research. The most common of its several isotopes has a half-life of 1,622 years. Atomic number 88. See Periodic Table.
The American Heritage® Student Science Dictionary, Second Edition. Copyright © 2014 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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| Noun | 1. |  radium - an intensely radioactive metallic element that occurs in minute amounts in uranium oresmetal, metallic element - any of several chemical elements that are usually shiny solids that conduct heat or electricity and can be formed into sheets etc. uranium ore - any ore from which uranium can be extracted |
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
Translations
راديوم: عُنْصُر فِلِزّي مُشِع
радий
rádium
radium
raadium
radij
rádium
radíum
radis
rad
radiu
rádium
Collins Spanish Dictionary - Complete and Unabridged 8th Edition 2005 © William Collins Sons & Co. Ltd. 1971, 1988 © HarperCollins Publishers 1992, 1993, 1996, 1997, 2000, 2003, 2005
Collins English/French Electronic Resource. © HarperCollins Publishers 2005
radium
Collins German Dictionary – Complete and Unabridged 7th Edition 2005. © William Collins Sons & Co. Ltd. 1980 © HarperCollins Publishers 1991, 1997, 1999, 2004, 2005, 2007
Collins Italian Dictionary 1st Edition © HarperCollins Publishers 1995
radium
(ˈreidiəm) noun a radioactive metallic element, used in treating certain diseases.
Kernerman English Multilingual Dictionary © 2006-2013 K Dictionaries Ltd.
ra·di·um
L. radium, radio, elemento metálico radioactivo y fluorescente usado en algunas de sus variaciones en el tratamiento de tumores malignos;
___needle → aguja de radio, divisa en forma de aguja que contiene radio usado en radioterapia.
English-Spanish Medical Dictionary © Farlex 2012
radium
n radio (elemento)English-Spanish/Spanish-English Medical Dictionary Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.