Where does “肋骨” come from?

肋骨 (Japanese) comes from Japanese 骨, from Sanskrit कपाल, from Proto-Indo-Iranian kapā́las, from Proto-Indo-European káp-ōl-, from Proto-Indo-European kap- — to seize, hold.

肋骨 (Japanese): a rib; a frame

Definitions

a rib; a frame

Ancestry of “肋骨”, step by step

肋骨 traces back through two separate lines of ancestry.

via Japanese 骨

Step	Language	Word	Meaning
1	Japanese	骨	bone; a bone, particularly a covering bone such...
2	Sanskrit	कपाल	skull, cranium; bowl
3	Proto-Indo-Iranian	kapā́las	skull
4	Proto-Indo-European	káp-ōl-	head, bowl
5	Proto-Indo-European	kap-	to seize, hold

via Japanese 肋

Step	Language	Word	Meaning
1	Japanese	肋	short for 肋骨: rib body part
2	Japanese	あばら	荒ら, 荒, 疎ら, 疎 loosely spaced, sparse, with large...
3	Japanese	あばらぼね	肋骨, あばら骨 a rib; 肋骨, あばら骨 a frame

Every word from Proto-Indo-European kap- →Every word from Proto-Indo-European káp-ōl- →Every word from Proto-Indo-Iranian kapā́las →