noun, Chemistry. 1. an isotope of polonium: polonium 210.
noun, Chemistry. 1. a white, crystalline, water-insoluble, poisonous, radioactive solid, RaSO 4 , used chiefly in radiotherapy.
noun 1. treatment of disease by means of radium. noun 1. treatment of disease, esp cancer, by exposing affected tissues to radiation from radium radium therapy n. The use of radium in radiotherapy.
[rey-dee-uh s] /ˈreɪ di əs/ noun, plural radii [rey-dee-ahy] /ˈreɪ diˌaɪ/ (Show IPA), radiuses. 1. a straight line extending from the center of a circle or sphere to the circumference or surface: The radius of a circle is half the diameter. 2. the length of such a line. 3. any or radiating part. 4. a […]