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Synonyms for protactinium

a short-lived radioactive metallic element formed from uranium and disintegrating into actinium and then into lead

References in periodicals archive ?
Among the law publications in this inventory were Littleton's Tenures, 400 copies of Natura Brevium in English, 500 in French, plus "centum and quinquaginta alios libros de natura brevium [one hundred and fifty other books of Natura Brevium].
The following are the books, other than Littleton's Tenures, Natura Brevium, and the yearbooks, published by both Smyth and Middleton.
7, Middleton-STC 15733); Natura Brevium (Smyth-STC 18397, Middleton-STC 18396 [1545?