Sindarin 

ost-in-edhil

place name. Fortress of the Eldar

Home of the Noldor in Eriador during the Second Age, described as the “city of the Elves” (S/286) and translated by Christopher Tolkien as “Fortress of the Eldar” (SI/Ost-in-Edhil). This name is a combination of ost “fortress, city”, the plural in of the definite article i and the plural of Edhel “Elf” (SA/os(t), edhel).

Elements

WordGloss
ost“fort, fortress, stronghold, citadel; fortified town; enclosure, fort, fortress, stronghold, citadel; (fortified) town, [N.] city; [orig.] [S.] enclosure, [G.] yard”
i“the”
Edhel“Elf”
Sindarin [S/286; SA/edhel; SA/os(t); SI/Ost-in-Edhil; UTI/Ost-in-Edhil] Group: Eldamo. Published by