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n. Abbr. rd
A unit expressing the rate of decay of radioactive material, equal to one million disintegrations per second, or one million becquerels.
[After Ernest Rutherford.]
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.
1. (Biography) Ernest, 1st Baron. 1871–1937, British physicist, born in New Zealand, who discovered the atomic nucleus (1909). Nobel prize for chemistry 1908
2. (Biography) Dame Margaret. 1892–1972, British stage and screen actress. Her films include Passport to Pimlico (1949), Murder She Said (1962), and The VIPs (1963)
3. (Biography) Mark, original name William Hale White. 1831–1913, British novelist and writer, whose work deals with his religious uncertainties: best known for The Autobiography of Mark Rutherford (1881) and the novel The Revolution in Tanner's Lane (1887)
(Units) a unit of activity equal to the quantity of a radioactive nuclide required to produce one million disintegrations per second. Abbreviation: rd
[C20: named after Ernest Rutherford]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
Ruth•er•ford(ˈrʌð ər fərd, ˈrʌθ-)
1. Daniel, 1749–1819, Scottish physician and chemist.
2. Ernest (1st Baron Rutherford of Nelson), 1871–1937, English physicist, born in New Zealand: Nobel prize for chemistry 1908.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
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|Noun||1.||rutherford - a unit strength of a radioactive source equal to one million disintegrations per second|
radioactivity unit - a measure of radioactivity
|2.||Rutherford - British chemist who isolated nitrogen (1749-1819)|
|3.||Rutherford - British physicist (born in New Zealand) who discovered the atomic nucleus and proposed a nuclear model of the atom (1871-1937)|
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