S. †im³ n. “valley” (Category: Dale, Valley)
An archaic element meaning “valley” that survived only in compounds, a derivation of ✶imbi “between” (VT47/14). The basic sense “valley” was transferred to its more elaborate form imlad as in Imladris “Rivendell”, and †im “valley” fell out of use due to its conflicted with other words like the reflexive pronoun im.
References ✧ VT42/18; VT47/14
|✶imbi > imm > im||[imbi] > [imbe] > [imb] > [imm] > [imm] > [im]||✧ VT47/14|
Reference ✧ EtyAC/IMBE ✧ “dell, deep vale”
|ᴹ√IMBE > im(b) > imm||[imbe] > [imb] > [imb] > [imm] > [im]||✧ EtyAC/IMBE|