Oscos

A wikipedia galega só fala de Oscos na entrada Reserva da biosfera Río Eo, Oscos e Terras de Burón Oscos, preto de Galicia:

os2, prep. Over, above. 1. Lit:~ talamh, above ground. ~ Bóinn, on, above, the Boyne. ~ mo neart, above my strength. ~ a mhuintir, ruling his people. ~ gach flaith, greater than all princes. 2. (In prep. and adv. phrases) ~ cionn, over, above; more than; beyond; in charge of; hanging over, threatening. S.a. ceann1. ~ coinne, ~ comhair, in front of, opposite. S.a. ard13, coinne 2(d), comhair12, íseal13, meán14, méid 2. (Var:ós1)

os-3, pref. Over, above; super-, supra-

cos, f. (gs. coise, npl. ~a, gpl. ~; ds. cois used in certain phrases).1. Leg; foot. En Galicia, ladeira de monte.

Oscos=sobre a ladeira.