PROTACTINIUM

Pronunciation (US):

(GB):

 I. (noun) 

Sense 1

Meaning:

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

Synonyms:

atomic number 91; Pa; protactinium; protoactinium

Classified under:

Nouns denoting substances

Hypernyms ("protactinium" is a kind of...):

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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