√EYE root. “feminine”
A primitive suffixal form appearing in Common Eldarin: Noun Structure and serving as the basis of feminine words, most notably the femininizing suffixes -ī and -ē (PE21/82-83). For most purposes, though, I think it is best to stick with the better attested √INI for feminine words.
Reference ✧ PE21/83 ✧ EJE “feminine”