A metallic chemical element discovered in 1898 by M. and Mme. Curie of Paris. It is found in pitchblende and is capable of maintaining itself at a higher temperature than the surrounding atmosphere and of giving forth powerful invisible radiations.
" Just a common, ordinary pin," he said, " no radium about that." – The Diamond Pin by Carolyn Wells
Scraps turned around and found a row of girls seated in radium chairs ranged along one wall of the room. – The Patchwork Girl of Oz by L. Frank Baum