A root in the Qenya and Gnomish Lexicons given as ᴱ√IŘI (QL/43) and iđ- (GL/50), the latter more representative of its true form. In the Qenya Lexicon it was glossed “dwell”, but Tolkien marked this gloss with a “?”. It had derivatives like ᴱQ. indo/G. ind “house”, ᴱQ. irmin/G. Idhru “world”, and ᴱQ. Indi/G. idhrin “men, earth dwellers”. Based on the last of these, a probable variant is the deleted root ᴱ√(I)LÐ(I)L, also in the Qenya Lexicon with the (rejected) derivative ᴱQ. ildi “men” (QL/42).
There are no signs of this root in Tolkien’s later writing, and both “men” and “world” were generally derived from other roots, the latter from √MBAR “dwell”, the likeliest replacement for this root.