radiothorium

[rey-dee-oh-thawr-ee-uh m, -thohr-]

noun Chemistry.

a disintegration product of thorium.

Origin of radiothorium

From New Latin, dating back to 1920–25; see origin at radio-, thorium
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019