-nil, final element in compounds, similar in meaning to Old English "-wine", sc. "-friend" as an element in names (NIL/NDIL). Also long -nildo (VT46:4). Variant of -ndil. In Eärnil, contraction of Earendil.
Quenya
-(n)dil
suffix. -friend, -lover; devotion, disinterested love
-dil
-wine
-dil
suffix. -friend, -lover
-nil
-wine
-nil
suffix. -friend, -lover
quendil
masculine name. Elf-friend
meldo
noun. friend, lover
-dil, -ndil, ending that Tolkien likened to Old English "-wine", sc. "-friend" as part of names, e.g. Elendil, Eärendil (NIL/NDIL); see the entry -ndil. Also long -dildo (VT46:4), and possibly -(n)dilmë as the corresponding feminine form (see Vardilmë).