7.3.118
औत्
Operational rule vidhi
The ङि-प्रत्यय gets औ आदेश when it comes after a ह्रस्व-इकारान्त or ह्रस्व-उकारान्त word.
Word by word (padaccheda)
Substitute / term औत् prathamā · ekavacana
- Substitute / term Prathamā (1st case): in operational rules, the substitute or the thing introduced; in definitions, the term or its referent.
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Full reading
औत्
Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.
Commentary
After a अङ्ग (stem) ending in short इ and उ and which is not नदी -- यू स्त्र्याख्यौ नदी 1.4.3 or घि -- शेषो घ्यसखि 1.4.7, औ is substituted for the इ of the Locative -7th case singular.
As सख्यौ, पत्यौ ॥
In the case of नदी words आम् is taught by the previous sutras; in the case of घी words औ preceded by अ substitution of घि letters will be taught in the next sutra, so by the rule of exclusion, the present sutra applies to words other than nadi and ghi.
Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.