वातातिसाराभ्यां कुक् च

Operational rule vidhi

The augment कुक् comes before इनि (इन्) after the words 1. वात and 2. अतिसार.

Word by word (padaccheda)

Left context वात- अतिसाराभ्याम् pañcamī · dvivacanaSubstitute / term कुक् prathamā · ekavacanaIndeclinable च avyaya

Left context Pañcamī (5th case): "after X", the operation applies to what follows (1.1.67 तस्मादित्युत्तरस्य). Also used for limits and sources.
Substitute / term Prathamā (1st case): in operational rules, the substitute or the thing introduced; in definitions, the term or its referent.
Indeclinable An avyaya such as च "and", वा "optionally", न "not".

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Full reading

वात-अतिसाराभ्याम् कुक् च

Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.

Commentary

The augment कुक् comes before इनि (इन्) after the words 1. वात and 2. अतिसार।
The words वात and अतिसार being names of diseases, will take इनि by the fore-going sutra; the present aphorism only teaches the affixing of the augment. Thus वातकी, अतिसारकी ॥ Another reading is अतीसारकी ॥

Vart:- So also after पिशाच, as पिशाचकी वैश्रवणः 'the Kubera'.

This is when the words वात and अतिसार denote diseases. Otherwise, वातवती गुहा ॥

Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.