The original Sindarin name and translation of Khazad-dûm (S/91, WJ/389), a compound of Hadhod “Dwarf” and rond “vault” (SA/hadhod, rond; WJ/414), changed to Moria after its fall into darkness.
Conceptual Development: Earlier Sindarin translations include Nornhabar (WJ/209) and Dornhabar (PE17/35).
S. for Khazad-dûm; Hadhod (rendering of Khazad into S sounds) + rond (“dome-roofed hall”)