A word appearing as ᴱN. asg “bone” in Early Noldorin Word-lists of the 1920s (PE13/137, 160). G. asg “bone” also appeared in the Gnomish Lexicon of the 1910s with a variant form asc and the glosses “bone (especially of other animals, rarely of men); stone of fruit” (GL/20). This 1910s form was clearly related to ᴱQ. as “bone” from the contemporaneous Qenya Lexicon (QL/33).

Neo-Sindarin: In the 1960s, Tolkien used the Quenya word axo for bone (MC/223) and Fiona Jallings suggested ᴺS. ach as its Sindarin equivalent. Unfortunately, that clashes with attested S. ach “neck” (PE17/92), so I prefer to retain ᴺS. asg for “bone”, and assume it is derived from primitive *ᴺ✶askō, where the primitive sk became sg in Sindarin, just as it did in earlier iterations of the language.