The primitive form ᴱ✶mḷgo appeared in Early Noldorin word lists of the 1920s serving as the basis for various “oil” words (PE13/139). It may have replaced ᴱ√ILI¹ “shine oily” from the Qenya Lexicon of the 1910s (QL/42), and may in turn have been replaced by √LIP “oil” from a list of roots from 1968 (VT44/15), though in this list √LIP had no derivatives.

Neo-Eldarin: For purposes of Neo-Eldarin, I think it is worth positing a Neo-Eldarin root √MILIG to salvage derivatives of 1920s ᴱ✶mḷgo.