Definition of "radium" in English

noun

1. The chemical element (symbol Ra) with an atomic number of 88. It is a soft, shiny and silvery radioactive alkaline earth metal.

2. (textiles, dated) A type of cloth woven from silk or synthetic yarn, often with a shiny appearance.

verb

1. (ambitransitive, obsolete) To treat (a tumour, etc.) with radium.