cilya is a noun meaning "chasm, cleft, gorge" in Quenya.
cilya derives from the root KIL-.
 See also
J.R.R. Tolkien, Christopher Tolkien (ed.), Morgoth's Ring, "Part Two. The Annals of Aman: Commentary on the third section of the Annals of Aman", p. 89
- ↑ J.R.R. Tolkien, Christopher Tolkien (ed.), The Lost Road and Other Writings, "Part Three: The Etymologies", KIL-