आदिर्णमुल्यन्यतरस्याम्

Operational rule vidhi

The first syllable may be optionally acute when the absolutive affix णमुल् follows.

Word by word (padaccheda)

Substitute / term आदिः prathamā · ekavacanaRight context णमुलि saptamī · ekavacanaRight context अन्यतरस्याम् 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

आदिः णमुलि अन्यतरस्याम्

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

Commentary

The first syllable may be optionally acute when the absolutive affix णमुल् follows.
Thus लो꣡लूयम् or लोलू꣡यम् ॥ In the reduplicate form लोलू, the second part लू is unaccented by 8.1.3. The present sutra makes लो accented. When लो is not accented, लू will get the accent by लित् accent. This rule is confined to polysyllabic Absolutives, namely to reduplicated Absolutives 8.1.4.

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