in, a strange particle occurring in the phrase i-coimas in-Eldaron "the coimas [lembas] of the Eldar" in PM:403. It looks like the Sindarin plural article, but in Quenya i is both sg. and pl. "the", and the word Eldar does not normally take any article at all. The alternative reading i-coimas Eldaron (PM:395) is probably to be preferred. -wë a suffix occurring in many personal names, generally but not exclusively masculine; derived from a stem simply meaning "person"
ar- (prefix) "outside" (AR2), element meaning "beside" (VT42:17)