ᴹ√YUL root. “smoulder”
A root in The Etymologies of the 1930s glossed “smoulder” with derivatives like ᴹQ. yúla/N. iûl “ember(s)” and ᴹQ. yulma/N. iolf “brand” (Ety/YUL). In all likelihood it was supplanted by the later root √YUL “drink”.
Neo-Eldarin: For purposes of Neo-Eldarin, I’d recommend positing a Neo-Root √YOL “smoulder”, which could salvage the Noldorin derivatives of this root. This doesn’t clash with (Neo-)Sindarin derivatives of √YUL “drink”, since in Sindarin the initial yu- became the (vowel) y, as in S. ylf “drinking-vessel” (WJ/416).
References ✧ Ety/GUL, YUL