放射性 fàngshèxìng radioactivity Origin Definitions Defs Strokes Stroke Words Sentences Sents 放射 fàngshè noun to radiate To emit rays of light or energy from a central point outward; also used to describe radioactivity.性 xìng affix [-ity] Suffix used after verbs or adjectives to form nouns expressing a state, quality, or scope, similar to English "-ity", "-ness", or "-ism".