The name of Aragorn’s sword after it was reforged (LotR/277), rechristened from its original name Narsil. This new name is a combination of the prefix andú- “west” and the root √RIL “brilliance” (PE17/35, 47). It was translated “Flame of the West” (LotR/277, Let/425).
Conceptual Development: Aragorn’s sword was long called Branding in Lord of the Rings drafts, and ᴹQ. Andúril did not appear until a late typescript (WR/370).
Andúril noun "Flame of the West", sword-name (LotR1:II ch. 3)