Definitions
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun Alternative form of
protactinium . (dated)
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun a short-lived radioactive metallic element formed from uranium and disintegrating into actinium and then into lead
Etymologies
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Examples
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Thus were found the mesothorium now used by physicians and manufactured industrially, radio-thorium, ionium, protoactinium, radio-lead, and other substances.
Pierre Curie 1923
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That's radioactive, but it takes two million years before it becomes protoactinium, which changes to uranium in twenty-seven days, which changes to thorium after a hundred and sixty thousand years, which changes to radium, then to actinium, then to -- "
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