A Doriathrin adjective meaning “(pale) blue” derived from the root ᴹ√ƷEL (Ety/ƷEL), probably from a primitive form ✱✶ʒelwā [ɣelwā] based on its cognates. If so, the [[ilk|initial [ɣ] became [g]]], the [[ilk|primitive final [a] vanished]], after which the [[ilk|final [w] became [u]]]. These developments were noted by Helge Fauskanger (AL-Doriathrin/gelu).
Quenya
helwa
(pale) blue
helwa adj. "(pale) blue" (3EL)