Sindarin 

thuringud

masculine name. Hidden Foe

A name that Túrin assumed in Nargothrond translated “Hidden Foe” (WJ/256), a combination of thurin “secret, hidden” and the lenited form of cûd “foe”, the latter element suggested by Patrick Wynne (VT49/25).

Sindarin [WJ/256; WJI/Thuringud] Group: Eldamo. Published by

gûd

enemy

(i ngûd = i ñûd, o n’gûd = o ñgûd, construct gud) (foe), pl. guid (in guid = i ñgŷd). Isolated from the name Thuringud, Hidden Foe.