STEL is a root signifying "remain firm". A derivative of STEL is said to be contained as the "[l]atter element" in the names Ecthelion and Aegthelion.
- ↑ 1.0 1.1
J.R.R. Tolkien, Christopher Tolkien (ed.), The War of the Jewels, "Part Three. The Wanderings of Húrin and Other Writings not forming part of the Quenta Silmarillion: III. Maeglin", p. 318-9 (form "√stel"