When a case-affix having an indicatory ṅ (ṅit) follows, then feminine words ending in short i and u are optionally termed nadī , as well as feminine nouns in long ī and ū which admit iyaṅ and uvaṅ ; but not so the word strī which is always nadī,
Feminine words in long i and u have been defined as nadi, words in short vowels can never be termed nadi, while even some words in long vowels have also been excluded from the scope of the definition if they take iyan and uvan The present sutra declares an option in the case of all the above words, when a case-affix having an indicatory ङ follows.
The case-affixes having an indicatory n are the Dative, Ablative. Genitive and Locative singulars. Thus we have:--
Dative मतये or मत्यै, धेनवे or धेन्वै, श्रिये or श्रियै; Ablative and Genitive मतेः or मत्याः, धेनो or धेन्वाः, श्रियः or श्रियाः; Locative मतौ or मत्याम्, धेनौ or धेन्वां, श्रियि or श्रियां. So also भ्रुवै or भ्रुवे & c. But stri is always स्त्र्यै &c.,