radio-carbon

n [U] radioactive form of carbon present in organic materials, used in carbon dating 放射性碳（有机材料中碳元素的放射性形式, 用以测定某物的年代）.

radiant, radiantly, radiate, radiation, radiation sickness, radiator, radical, radicalism, radically, radicle, radii, radio, radio astronomer, radio astronomy, radio car, radio cab, radio frequency, radio telescope, radio transmitter, radio-, radio-astronomer, radio-controlled, radio-frequency, radio-therapist, radio-therapy, radioactive, radioactivity, radiogram, radiograph, radiographer, radiography, radioisotope, radiologist, radiology, radish, radium, radius, radon, RAF, raffia, raffish,