Actinouranium Definition
ăk-tĭnō-yo͝o-rānē-əm, ăktə-nō-
noun
The isotope of uranium with mass number 235, fissionable with slow neutrons.
American Heritage
The uranium isotope of mass number 235: begins the actinium series.
Webster's New World
Wiktionary
Origin of Actinouranium
actin(ium) uranium
From American Heritage Dictionary of the English Language, 5th Edition
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