4.2.141
वृद्धादकेकान्तखोपधात्
Operational rule vidhi
The affix छ comes in the remaining senses after a वृद्ध word denoting a place and ending with अक् or इक् or having ख as its penultimate.
Word by word (padaccheda)
Left context pañcamī · ekavacanaLeft context अक- इक- अन्त- ख- pañcamī · ekavacana
- Left context Pañcamī (5th case): "after X", the operation applies to what follows (1.1.67 तस्मादित्युत्तरस्य). Also used for limits and sources.
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Full reading
अक-
Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.
Commentary
The affix छ comes in the remaining senses after a वृद्ध word denoting a place and ending with अक् or इक् or having ख as its penultimate.
The word देशे must be read into the sutra. This debars the अण् of Sutra 132 ante: as well as the affixes ordained by Sutras 117 and 123.
Thus अकः — आरोहणकीयम्, द्रौघणकीयम् ॥ इकः —आश्वपथिकीयम्, शाल्मलिकीयम् ॥ खोपधात् :-- कौटिशिखीयम्, आयोमुखीयम् ॥
Vart:- The words सौसुक &c. are also governed by this rule though they end in उक ॥ Thus सौसुकीयम्, मौसुकीयम्, ऐन्द्रवेणुकीयम् ॥
Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.