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prot•ac•tin•i•um



Pronunciation: (prō"tak-tin'ē-um), [key]
n. Chem.
a radioactive, metallic element. Symbol: Pa; at. no.: 91. Also,protoactinium.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

prot-protagonist
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