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1. (n.) protactinium
a radioactive, metallic chemical element.
Etymology: (1915–20)
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| Definition of 'Protactinium' |
Princeton's WordNet |
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1. (noun) protactinium, protoactinium, Pa, atomic number 91
a short-lived radioactive metallic element formed from uranium and disintegrating into actinium and then into lead
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| Definition of 'Protactinium' |
U.S. National Library of Medicine |
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1. Protactinium
Protactinium. A radioactive element of the actinide group of metals. It has the atomic symbol Pa, atomic number 91, and atomic weight 231. It decays by alpha-emission.
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Definitions of Protactinium 
