actinouranium


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ac·tin·o·u·ra·ni·um

 (ăk-tĭn′ō-yo͝o-rā′nē-əm, ăk′tə-nō-)
n.
The isotope of uranium with mass number 235, fissionable with slow neutrons.

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.

actinouranium

(ˌæktɪnəʊjʊˈreɪnɪəm)
n
(Elements & Compounds) the isotope of uranium that has a mass number of 235
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

uranium 235


n.
the radioactive uranium isotope having a mass number of 235 and that undergoes fission with a release of energy when bombarded with neutrons.
[1935–40]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.