A name for Doriath translated “Outside the Fence”, a compound of argad “outside the fence” (Ety/AT(AT)) and dôr “land” (Ety/GAT(H), AR²). Thus, its literal meaning is “[Land] Outside the Fence”.
Doriathrin
argad
noun. exterior, outside, (lit.) outside the fence
argador
place name. [Land] Outside the Fence
A Doriathrin noun meaning “the exterior, the outside”, literally “outside the fence” (Ety/GAT(H)). It is a combination of ar- “outside” and gad “fence”. The entry in The Etymologies also had a rejected variant argadon (EtyAC/GAT(H)).