r 1 a 1 d 2 o 1 n 1
5 letters · 6 points in Scrabble
Meaning
noun a radioactive gaseous element formed by the disintegration of radium; the heaviest of the inert gasses; occurs naturally (especially in areas over granite) and is considered a hazard to health
originContraction of radium emanation, since the element appears in the radioactive decay of radium. By surface analysis, radio- + -on (“suffix for noble gases”).
Etymology from Wiktionary, CC BY-SA 3.0