noun
a radioactive metallic element that is a member of the actinide series, used in nuclear reactors and bombs
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Actinouranium is a radioactive element with atomic number 92.
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Have you heard about actinouranium? It's a really cool radioactive element.
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I wouldn't mess with actinouranium if I were you, it's pretty dangerous stuff.
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Her words were like actinouranium, causing a reaction wherever they landed.