Sindarin 

eryn lasgalen

place name. Greenwood the Great, (lit.) Wood of Greenleaves

The name of Mirkwood after its restoration at the end of the War of the Ring (LotR/1094, Let/382). The initial element is eryn “woods”, and the second element is a compound of lass “leaf” with the lenited form of calen (PE17/33, Let/382). Elsewhere, L(h)asgalen “Green of Leaf” was given as one of the names for Laurelin (LR/210, MR/155).

Elements

WordGloss
eryn“wood, forest (of trees)”
lass“leaf, leaf; [G.] petal”
calen“green; fresh, vigorous; †bright, green; †bright, [N.] bright-coloured; [S.] fresh, vigorous”
Sindarin [Let/382; LotR/1094; LotRI/Mirkwood; LRI/Eryn Lasgalen; PE17/033; UT/281; UTI/Eryn Lasgalen] Group: Eldamo. Published by