Another name for the Noldor appearing in name lists and The Etymologies from the 1930s (LR/403, Ety/IS). It seems to be a combination of istima “wise” and the plural of the agental suffix -mo. It was initially written as Ainimor.
collective name. The Wise
Word Gloss istima “having knowledge, wise, learned” -mo “agental suffix”
- Ainimor ✧ LR/403; LRI/Ainimor