Ai! Lá polin saca i quettar!
A noun appearing as ᴱQ. aiko (aiku-) “cliff” in the Qenya Lexicon of the 1910s, apparently a noun variant of ᴱQ. aiqa “steep” appearing nearby (QL/29). Since ᴹQ. aiqa “steep” continued to appear in Tolkien’s later writings (Ety/AYAK), perhaps this word can be salvaged for Neo-Quenya writing as ᴺQ. aico (aicu-).