Aldalómë
From Tolkien Gateway
Aldalómë was a name of Fangorn forest, used by Treebeard. J.R.R. Tolkien notes in his Unfinished Index that it means 'tree-twilight', and refers to Quenya words alda 'tree' and lómë 'dimness, twilight, night' (quoted in Scull - Hammond, Reader's Companion, p. 385).