背筋 はいきん Meanings Noun muscles of the back; back muscles Kanji 背 back. Read as ハイ. 筋 muscle. Read as キン. Words containing 背筋 広背筋 (こうはいきん) latissimus dorsi muscle 背筋力 (はいきんりょく) strength of one's back Jinuma: Japanese Dictionary · Word lists