विभाषा रोगातपयोः

Operational rule vidhi

The affix ठञ् comes optionally comes in the remaining senses after the word शरद् when expressing illness or heat.

Word by word (padaccheda)

Substitute / term prathamā · ekavacanaRight context रोग- आतपयोः saptamī · dvivacana

Substitute / term Prathamā (1st case): in operational rules, the substitute or the thing introduced; in definitions, the term or its referent.
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").

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Full reading

रोग-आतपयोः

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

Commentary

The affix ठञ् comes optionally comes in the remaining senses after the word शरद् when expressing illness or heat.
Thus शारदिको रोगः 'the autumnal disease', शारदिक आतपः 'the autumnal heat or sunshine'.

Why do we say "when denoting sickness or heat"? Observe, शारदं दधि 'the autumnal curd'. This ठञ् debars the ऋतु अण् 4.3.16.

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