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Protactinium
Language:
English
Pronunciation:
protac-tini-um
Part of Speech:
noun
Defined Definitions
DictionaryAPI
A chemical element (symbol Pa) with atomic number 91: a dense, silvery-gray actinide metal.
User Defined Definitions
"a short-lived radioactive metallic element formed from uranium and disintegrating into actinium and then into lead"
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