Edhel (pron. [ˈeðel]), plural Edhil (pron. [ˈeðil]), is the Sindarin word for elf. It was one of the most common words in Sindarin.
OS *edelo from root É-DEL
J.R.R. Tolkien, Christopher Tolkien (ed.), The War of the Jewels, "Part Four. Quendi and Eldar"