伽马辐射 jiāmǎfúshè gamma radiation Origin Definitions Defs Strokes Stroke Words Sentences Sents 伽马 伽馬 gāmǎ gamma (loanword) gamma, the third letter of the Greek alphabet辐射 輻射 fúshè noun radiation radiation; to radiate or emit energy in the form of waves or particles, such as electromagnetic waves or radioactive decay.