Kanji What does the kanji 脊 mean? 脊 means spine, backbone. On'yomi セキ. Kun'yomi せ、せい. Quick factsOn'yomiセキKun'yomiせ、せいStrokes10 脊On'yomi セキKun'yomi せ、せい10 strokesspine, backboneBuilt from月moon, month 4 strokes二two 2 strokes人person 2 strokesStroke order · 10 strokesWatch it written12345678910