bone: [OE] Somewhat unusually for a basic body-part term, bone is a strictly Germanic word: it has no relatives in other Indo-European languages. It comes from a presumed Germanic *bainam, which also produced for example German bein and Swedish ben. These both mean ‘leg’ as well as ‘bone’, suggesting that the original connotation of *bainam may have been ‘long bone’. [bone etymology, bone origin, 英语词源]