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| a fool or simpleton; ninny. |
| an extraordinary or unusual thing, person, or event; an exceptional example or instance. |
Based on the Random House Dictionary, © Random House, Inc. 2012.
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2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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roentgen
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roentgen roent·gen or rönt·gen (rěnt'gən, -jən, rŭnt'-)
n.
Abbr. R, r
A unit of radiation exposure that is equal to the quantity of ionizing radiation that will produce one electrostatic unit of electricity in one cubic centimeter of dry air at 0°C and standard atmospheric pressure.
Roentgen Roent·gen (rěnt'gən, -jən, rŭnt'-) or Rönt·gen (rɶnt'gən), Wilhelm Konrad. 1845-1923.
German physicist who discovered x-rays and developed x-ray photography, revolutionizing medical diagnosis. He won a 1901 Nobel Prize.
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Roentgen  (rěnt'gən, rěnt'jən) Pronunciation Key
German physicist who discovered x-rays in 1895 and went on to develop x-ray photography, which revolutionized Medical diagnosis. In 1901 he was awarded the Nobel Prize for physics. |
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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roentgen
unit of X-radiation or gamma radiation, the amount that will produce, under normal conditions of pressure, temperature, and humidity, in 1 kg (2.2 lbs) of air, an amount of positive or negative ionization equal to 2.58104 coulomb. It is named for the German physicist Wilhelm Conrad Rontgen. See also rem.
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