From Tolkien Gateway
ailin means "pool, lake" or "large lake" in Quenya.
In the Etymologies, ailin is conceived as deriving from Primitive Quendian ai-lin-, derived from root AY. In a later conception, the word is said to have "originally contained √AYA(R) + lin" (cf. LINI).
- ↑ 1.0 1.1 1.2 J.R.R. Tolkien, Christopher Tolkien (ed.), The Lost Road and Other Writings, Part Three: "The Etymologies", p. 349
- ↑ 2.0 2.1 J.R.R. Tolkien, "Words, Phrases and Passages in Various Tongues in The Lord of the Rings: Eldarin Roots and Stems", in Parma Eldalamberon XVII (edited by Christopher Gilson), p. 160