An early dwarf name of unknown meaning appearing in the first draft of the chapter “The Mines of Moria” in the phrase “the dwarflords of Uruktharbun” (RS/458). According to Christopher Tolkien (RS/465, note 36), the name Azanulbizâr (Dimrill-dale) was pencilled next to it, but in the next version of the chapter it was changed to Khazad-dûm (Moria), so Uruktharbun could be the precursor of either of these later names.