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thoron

tho·ron

noun \ˈthō(ə)r-ˌän, ˈthȯ(ə)r-\

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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thoron

tho·ron

Definition of THORON

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thoron

tho·ron

Definition of THORON

Test Your Vocabulary

Name That Thing

True or False?

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The Merriam-Webster

Unabridged Dictionary

Learning English?

We can help.

Our Dictionary,On Your Devices

Visit Our Store

Join Us

Bookstore: Digital and Print

Other Merriam-Webster Dictionaries

Our Dictionary,
On Your Devices