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actinouranium

American  
[ak-tin-oh-yoo-rey-nee-uhm, ak-tuh-noh-] / ækˌtɪn oʊ yʊˈreɪ ni əm, ˌæk tə noʊ- /

noun

Chemistry.

  1. uranium 235.

actinouranium British  
/ ˌæktɪnəʊjʊˈreɪnɪəm /

noun

  1. the isotope of uranium that has a mass number of 235

"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

Etymology

Origin of actinouranium

First recorded in 1925–30; actino- + uranium

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.