The Adûnaic name for the capital of Númenor, whose Quenya name is Armenelos (SD/363, PM/145). The final element -êth seems to be a feminizing suffix, also seen in Ad. Akallabêth. The initial element Ar- is the same as that used in the name of kings and queens, and the middle element minal means “heaven”, so perhaps the literal meaning is something like *“Royal Heaven (City)”, similar in the sense to the Quenya name.
arminalêthproper name. *Royal Heaven (City)