Quenya 

osto

noun. fortress, stronghold, strong place, *[ᴹQ.] city, *town with wall round
Quenya [MR/350; MR/471; SA/os(t); VT39/06; WJ/414] Group: Eldamo. Published by

osto

noun. city
Quenya [PE 22:124] Group: Mellonath Daeron. Published by

osto

the gates of the sun

osto (2) noun "the gates of the Sun" (LT1:264; this "Qenya" word was probably obsoleted by # 1 above)

osto

strong or fortified building or place, strong place, fortress

osto (1) noun "a strong or fortified building or place, strong place, fortress" (MR:350, 471; WJ:414); "city, town with wall round" (OS, VT46:8)

Túrosto

gabilgathol

Túrosto place-name "Gabilgathol", a dwelling of the Dwarves (Sindarin Belegost; the names mean "Mickleburg", "Great Fortress"). Apparently túra + osto.