Entrance to a tunnel leading from Dor-lómin to Cirith Ninniach, translated “Gate of the Noldor” (S/238). It is a combination of annon “gate”, the plural in of the definite article i, and the plural Gelydh of Golodh “Noldo”.
Sindarin
Annon-in-Gelydh
noun. gate of the Noldor
annon-in-gelydh
place name. Gate of the Noldor
Elements
Word Gloss annon “(great) gate, door” i “the” Golodh “one of the wise folk, Noldo”
annon (“great door or gate”) + in (pl. genitive article) + (n-)Gelyth (pl. of (n-)Golodh “Noldor”)