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protoactinium

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protoactinium [ˌprəʊtəʊækˈtɪnɪəm]
n
(Chemistry / Elements & Compounds) the former name of protactinium
ThesaurusLegend:  Synonyms Related Words Antonyms
Noun1.protoactinium - a short-lived radioactive metallic element formed from uranium and disintegrating into actinium and then into leadprotoactinium - a short-lived radioactive metallic element formed from uranium and disintegrating into actinium and then into lead
atomic number 91, protactinium, Pa
metal, metallic element - any of several chemical elements that are usually shiny solids that conduct heat or electricity and can be formed into sheets etc.
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In a unique instance of double embedment, there is acTINium and protoACTINIUM.
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