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protactinium British & World English

The chemical element of atomic number 91, a radioactive metal of the actinide series, occurring in small amounts as a product of the natural decay of uranium

Pa in protactinium British & World English

The chemical element of atomic number 91, a radioactive metal of the actinide series, occurring in small amounts as a product of the natural decay of uranium

protactinium New Oxford Dictionary for Writers & Editors

chemical element of atomic number 91