radiothorium

[ rey-dee-oh-thawr-ee-uhm, -thohr- ]

noun

, Chemistry.

1. a disintegration product of thorium.

Word History and Origins

Origin of radiothorium¹

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

Example Sentences

The dogs are injected with graduated amounts of plutonium, radium, radiothorium or mesothorium.

From Time Magazine Archive