Rn

n 1: 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 [syn: {radon}, {Rn}, {atomic

number 86}]

2: a graduate nurse who has passed examinations for

registration [syn: {registered nurse}, {RN}]