The home of the Elves within Valinor (S/59). This name is a compound of Elda “Elf” and már “home”. As noted by Tolkien, it must have been a late compound, otherwise the more primitive form ✶-mbar of the second element would have been preserved as ✱✱Eldambar (PE17/106).
Conceptual Development: This name dates back all the way to the earliest Lost Tales, where it had essentially the same form, meaning and etymology (LT1/19, LTA1/Eldamar).
Eldamar place-name "Elvenhome" (ÉLED; found already in Narqelion), according to MR:176 another name of Tirion (see tir-).