ra·di·o·i·o·dine

[rey-dee-oh-ahy-uh-dahyn, -din, -deen]
noun Chemistry.
any of nine radioisotopes of iodine, especially iodine 131 and iodine 125, used as radioactive tracers in research and clinical diagnosis and treatment.

Origin:
1935–40; radio- + iodine

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American Heritage
Medical Dictionary

radioiodine ra·di·o·i·o·dine (rā'dē-ō-ī'ə-dīn')
n.
A radioactive isotope of iodine widely used as a tracer.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
Cite This Source
00:10
Radioiodine has a plethora of syllables.
So is pneumonoultramicroscopicsilicovolcanoconiosis. Does it mean:
a white, crystalline, water-insoluble solid, C14H9Cl5, usually derived from chloral by reaction with chlorobenzene in the presence of fuming sulfuric acid: used as an insecticide and as a scabicide and pediculicide: agricultural use prohibited in the U.S.
an obscure term ostensibly referring to a lung disease caused by silica dust, sometimes cited as one of the longest words in the English language.
Example sentences
It is rare, and does not respond to radioiodine therapy.
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