单词：protactinium
音标：[.prәutæk'tiniәm] ；
n. 镤
[化] 镤Pa
[化] 镤Pa
n. a short-lived radioactive metallic element formed from uranium and disintegrating into actinium and then into lead
词型变化：名词复数形式 : protactiniums
【近义词】
- pa<口>爸爸
- protoactinium镤