विभाषा श्यावारोकाभ्याम्

Operational rule vidhi

Optionally दत् is substituted for दन्त in a बहुव्रीहि समास when it is preceded by the words श्याव and अरोक.

Word by word (padaccheda)

Substitute / term prathamā · ekavacanaLeft context श्यावारोकाभ्याम् pañcamī · dvivacana

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

श्यावारोकाभ्याम्

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

Commentary

Optionally दत् is substituted for दन्त in a बहुव्रीहि समास when it is preceded by the words श्याव and अरोक।
Thus श्यावदन्तः or श्यावदन्, अरोकदन्तः or अरोकदन् ॥ अरोक means 'dark' 'non-luminous'. The word संज्ञायाम् of the last sutra governs this also, so that
when the compound is not a Name, the substitution does not take place; as श्यावदन्तः, अरोकदन्तः ॥

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