Q. indil n. “lily, other large single flower”
A Quenya noun for “lily” or more generally any “large flower”, cognate of Ad. inzil.
Conceptual Development: This word appeared in two forms with competing etymologies. In the early 1950s, it appeared as Q. insil, a loan word from Atani inzil, where the [nz] became [ns] (PE19/99). Around 1960 a similar word indil appeared in the Quendi and Eldar essay as a derivative of Valarin iniðil (WJ/399), where the middle i was lost due to the Quenya syncope and then later the spirant [ð] became the stop [d] after the nasal [n].
In the second scenario, Tolkien did not directly connect Q. indil to Ad. inzil, but the coincidence of forms is too great: Tolkien must have imagined a reverse loan from Valarin > Quenya > Atani. Perhaps this loan took place before the [ð] became [d] in Quenya ([nð] > [nd]), and the voiced spirant was adapted as the sibilant [z] in Atani because that language did not possess spirants in its earliest historical stages.
I personally prefer this second scenario and the form indil, because using the first scenario would require discarding one of our few Valarin words (iniðil).
References ✧ PE19/99; WJ/399
|Ed. inzil > insil||[inzil] > [insil]||✧ PE19/99|
|Val. iniðil > indil||[iniðil] > [inðil] > [indil]||✧ WJ/399|