Sindarin 

androth

place name. *Long Cave

Caves where Tuor dwelled in his youth (S/238). The name was not translated, but it is most likely a compound of and “long” and the lenited form roth of groth “cave”.

Sindarin [SI/Androth; UTI/Androth; WJI/Androth] Group: Eldamo. Published by

Androth

noun. long cave

and (“long”) + groth (“underground dwelling”)

Sindarin [Tolkiendil] Group: Tolkiendil Compound Sindarin Names. Published by