Definitions for iodine-131
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Princeton's WordNet
iodine-131(noun)
heavy radioactive isotope of iodine with a half-life of 8 days; used in a sodium salt to diagnose thyroid disease and to treat goiter
Wiktionary
iodine-131(Noun)
The radioactive isotope of iodine, , having a half-life of 8 days; used as a medical tracer
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"iodine-131." Definitions.net. STANDS4 LLC, 2013. Web. 22 May 2013. <http://www.definitions.net/definition/iodine-131>.

