• synonyms


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

noun Chemistry.

a disintegration product of thorium.

Nearby words

radiotherapeutics, radiotherapist, radiotherapy, radiothermy, radiothon, radiothorium, radiotoxemia, radiotoxic, radiotracer, radiotransparent, radiotropic

Origin of radiothorium

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