骨针

骨针	gǔ zhēn	spicule (in biology) / bone needle (in archaeology)
骨	gū	used in 骨碌碌 / used in 骨碌
骨	gǔ	bone
针	zhēn	needle / pin / injection / stitch / CL:根,支
针	zhēn	variant of 针, needle