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
Androth
noun. long cave
androth
place name. *Long Cave
Elements
Word Gloss and “long” groth “large excavation, delving, underground dwelling, large excavation, delving, underground dwelling; [N.] cave, tunnel, [G.] grot”
and (“long”) + groth (“underground dwelling”)