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thoron

noun
tho·​ron | \ ˈthō(ə)r-ˌän, ˈthȯ(ə)r- How to pronounce thoron (audio) \

Medical Definition of thoron

: a heavy radioactive isotope of radon of mass number 220 that is formed as a decay product of thorium, decays by emission of an alpha particle, and has a half-life of less than a minute

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