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Protactinium

//ˌpɹoʊ.tækˈtɪn.i.əm// noun

Definitions

Noun
  1. 1
    A chemical element (symbol Pa) with atomic number 91. A dense, silvery-gray actinide metal. uncountable
  2. 2
    a short-lived radioactive metallic element formed from uranium and disintegrating into actinium and then into lead wordnet

Etymology

From proto- + actinium.

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