WordReference Random House Unabridged Dictionary of American English © 2026
ac•tin•o•u•ra•ni•um
(ak tin′ō yŏŏ rā′nē əm, ak′tə nō-),USA pronunciation n. [Chem.]
- ChemistrySee uranium 235.
- actino- + uranium 1925–30
'actinouranium' also found in these entries (note: many are not synonyms or translations):