protoactiniumUS:USA pronunciation: respellingUSA pronunciation: respelling(prō′tō ak tin′ē əm)
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WordReference Random House Unabridged Dictionary of American English © 2026 pro•to•ac•tin•i•um
(prō′tō ak tin′ē əm),USA pronunciation n. [Chem.]
'protoactinium' also found in these entries (note: many are not synonyms or translations):
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