प्रमदसम्मदौ हर्षे

Operational rule vidhi

The words प्रमद and सम्मद are irregularly formed, meaning 'joy'.

Word by word (padaccheda)

Substitute / term प्रमद- सम्मदौ prathamā · dvivacanaRight context हर्षे saptamī · ekavacana

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

प्रमद-सम्मदौ हर्षे

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

Commentary

The words प्रमद and सम्मद are irregularly formed, meaning 'joy'.
As कन्यानां प्रमदः 'the joy of girls'; कोकिलानां सम्मदः 'the rejoicing of cuckoos'.

Why do we say 'when meaning delight'? Observe प्रमादः 'carelessness'; सम्मादः 'frenzy'.

Instead of saying 'the verb mad preceded by pra and sam takes the affix ap' which also would have given the above forms, the full forms have been used in the sutra to indicate that these words are रूढि in this sense; for the sense of the root is not visible in these words.

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