radiothorium

[ rey-dee-oh-thawr-ee-uh m, -thohr- ]
/ ˌreɪ di oʊˈθɔr i əm, -ˈθoʊr- /

noun Chemistry.

a disintegration product of thorium.

Origin of radiothorium

From New Latin, dating back to 1920–25; see origin at radio-, thorium