| / English Dictionary |
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:
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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