ᴱ√SIPI root. “whistle, pipe”
The root ᴱ√SIPI “whistle, pipe” appeared in the Qenya Lexicon of the 1910s with derivatives like ᴱQ. simp(in)a “pipe, flute, flageolot” and ᴱQ. sipi- “pipe” (QL/84). In the contemporaneous Gnomish Lexicon the derived forms were words like G. thibin “flute” and G. thimpa- “to play a flute or whistle”, indicating an actual root form *ᴱ√ÞIPI (GL/73). The Gnomish word G. Simfi “Wailers of the Shore” = ᴱQ. Solosimpe does hint at ᴱ√SIPI (GL/67), but I suspect it is a loan word as opposed to native Gnomish G. Thlossibrim (GL/73).
Neo-Eldarin: For purposes of Neo-Eldarin I think it is worth positing a Neo-Root ᴺ√THIP to salvage early “pipe” and “flute” words.
References ✧ LT1A/Solosimpi; QL/84