athrad (“river-crossing, ford, way”) + angren (“iron”) #The first element could be interpreted as: ath (prefix “on both sides, across”) + râd (“path, track”).
Sindarin
athrad angren
place name. Ford of Isen
Athrad Angren (pl. Ethraid Engrin)
noun. iron ford
A Sindarin name for the Ford of Isen, a combination of athrad “ford” and the adjective angren “of iron” (UT/318). It also appeared in a plural form Ethraid Engrin.