A verb appearing as S. ídha or íðra “long for, desire” in Notes on Names (NN) from 1957 where Tolkien was exploring the etymology of the name Idril (PE17/112). In this note he settle on the name Iðril and the root form √ID “desire”, but the page where this appeared was struck through. Tolkien eventually decided the root form was √IR “desire” and Idril was derived from unrelated √IT “glitter, sparkle” (PE17/155-156, PM/363).

Conceptual Development: The Gnomish Lexicon of the 1910s had a verb G. idra- “to value, prize” related to G. îd “a treasure, a thing of great worth, a jewel” and the name G. Idril “sweetheart” (GL/50). At this stage the root may have been something like *ᴱ√ITI “precious”.