掌骨

掌骨	zhǎng gǔ	metacarpal bone (long bones in the hand and feet)
掌	zhǎng	palm of the hand / sole of the foot / paw / horseshoe / to slap / to hold in one's hand / to wield
骨	gū	used in 骨碌碌 / used in 骨碌
骨	gǔ	bone