in

article, apparently a variant of the definite article i, observed 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 normally covers both sg. and pl. "the", and the word Eldar does not need any article at all. The alternative reading i-coimas Eldaron PM:395 is probably to be preferred.