The feminine ṅī (ī) added to a word formed by a taddhita affix having an indicatory u or ṛ is optionally shortened before the gha etc. -- gharūpakalpacelaḍbruvagotramatahateṣu ṅyo'nekāco hrasvaḥ [[6.3.43]].,
Thus श्रेयसितरा or श्रेयसीतरा, or श्रेयस्तरा, विदुषितरा or विदुषीतरा or विद्वत्तरा ॥ The first is formed by the Taddhita affix ईयसुन्, and the second by क्वसु ॥ In one alternative, there is masculisation also when we get the forms श्रेयस्तरा &c. Or this latter form may be considered to have been evolved from श्रेयस्, to which is added the affixes denoting comparison, and then the feminine affix, in denoting a feminine.,