A word meaning “tine, spike, point” (PE17/36) or “spike, sharp horn” (RC/775) as an element in names like S. Celebdil “Silvertine”. In a discussion of the word niphredil, Tolkien said til or -il meant “point, ending” (PE17/55).
Conceptual Development: The Etymologies of the 1930s had N. till “horn” as the cognate of ᴹQ. tilde “point, horn” under the root ᴹ√TIL “point, horn” (Ety/TIL).
n. point, ending. >> -il, niphredil