रोगाच्चापनयने

Operational rule vidhi

The affix तसि comes optionally after a word denoting a disease ending in the Genitive 6th-Case when the healing of the same is denoted.

Word by word (padaccheda)

Left context रोगात् pañcamī · ekavacanaIndeclinable च avyayaRight context अपनयने saptamī · ekavacana

Left context Pañcamī (5th case): "after X", the operation applies to what follows (1.1.67 तस्मादित्युत्तरस्य). Also used for limits and sources.
Indeclinable An avyaya such as च "and", वा "optionally", न "not".
Right context Saptamī (7th case): "when X follows", the operation applies to what precedes (1.1.66 तस्मिन्निति निर्दिष्टे पूर्वस्य). Also a condition or domain ("in the sense of").

Dotted words are technical terms. Hover or tap one to see its card.

Full reading

रोगात् च अपनयने

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

Commentary

The affix तसि comes optionally after a word denoting a disease ending in the Genitive 6th-Case when the healing of the same is denoted.
The word रोग means 'disease', and अपनयन means 'healing', 'curing'. Thus प्रवाहिकायाः प्रतीकारं कुरु = प्रवाहिकातः कुरु; so also छर्दिकातः कुरु ॥

Why do we say 'when healing is meant'? Observe प्रवाहिकायाः प्रकोपनं कुरु ॥

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