In the Etymologies, the root THUS (given no signification) yields the Primitive Quendian form thausā, from which derives Quenya (Qenya) saura. From this root also derives Noldorin thaw "corrupt, rotten", and thû "stench" (used as a proper name, Thû.
- J.R.R. Tolkien, "Words, Phrases and Passages in Various Tongues in The Lord of the Rings", in Parma Eldalamberon XVII (edited by Christopher Gilson), p. 183 (root appearing as "√THUS-"
- J.R.R. Tolkien, Christopher Tolkien (ed.), The Lost Road and Other Writings, Part Three: "The Etymologies", p. 393 (root appearing as "THUS-")