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3 definitions found

From: DICT.TW English-Chinese Dictionary 英漢字典

 protoactinium
 鏷[放射元素]

From: DICT.TW English-Chinese Medical Dictionary 英漢醫學字典

 pro·to·ac·tin·i·um /ˌproto-/ 名詞
 鏷

From: WordNet (r) 2.0

 protoactinium
      n : a short-lived radioactive metallic element formed from
          uranium and disintegrating into actinium and then into
          lead [syn: protactinium, Pa, atomic number 91]