胸筋 きょうきん Meanings Noun, の-adjective pectoral (muscle) Kanji 胸 chest. Read as キョウ. 筋 muscle. Read as キン. Words containing 胸筋 大胸筋 (だいきょうきん) pectoralis major muscle 小胸筋 (しょうきょうきん) pectoralis minor muscle Jinuma: Japanese Dictionary · Word lists