A prefix appearing before the Adûnaic names of kings and queens, the equivalent of Q. Tar- “High” (SA/ar(a)). It is most likely either a prefixal form of Ad. ârû “king” or derived from the same root. Conceptual Development: This prefix was introduced in the earliest versions of Adûnaic from the 1940s (SD/311, SD/248), and survived in the later Adûnaic names of The Lord of the Rings and The Silmarillion.
ar-prefix. king or queen
A noun translated as “king” (SD/429). The Adûnaic word for “queen” is not attested, but could be a feminized form of this word, such as *ârî.