丙种射线 bǐngzhǒngshèxiàn gamma ray Origin Definitions Defs Strokes Stroke Words Sentences Sents 丙 bǐng third The third in a sequence or rank, such as grade C or Roman numeral III种 種 zhǒng measure wordnoun kind type; sort; category; variety射线 射線 shèxiàn noun ray (physics) A stream of high-energy particles or electromagnetic waves, such as X-rays or alpha rays.