proto-actinium

英 [p'rəʊtəʊækt'ɪniəm] 美 [p'rəʊtəʊækt'ɪniəm]

• [医] 镤(91号元素)

英英释义

名词 protoactinium:

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