Protactinium Definition

prōtăk-tĭnē-əm
noun
A rare, radioactive, metallic chemical element, one of the actinides, found in pitchblende: symbol, Pa; at. no. 91
Webster's New World
Synonyms:

Origin of Protactinium

  • prot(o)– actinium (so called because it decays into actinium)

    From American Heritage Dictionary of the English Language, 5th Edition

  • proto- +"Ž actinium.

    From Wiktionary

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protactinium