Definitions
from The Century Dictionary.
- noun A substance formed by the disintegration of radium and the fourth of the series of radioactive disintegration-products following the emanation, for which reason it is known as radium D.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun
radioactive lead (especially when used as a tracer)
Etymologies
from Wiktionary, Creative Commons Attribution/Share-Alike License
From radio- + lead
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