radioactivity

n.放射性

radical, radicalism, radically, radicle, radii, radio, radio astronomer, radio astronomy, radio car, radio cab, radio frequency, radio telescope, radio transmitter, radio-, radio-astronomer, radio-carbon, radio-controlled, radio-frequency, radio-therapist, radio-therapy, radioactive, radiogram, radiograph, radiographer, radiography, radioisotope, radiologist, radiology, radish, radium, radius, radon, RAF, raffia, raffish, raffishly, raffishness, raffle, raft, rafter, raftered,