पाथोनदीभ्यां ड्यण्

Operational rule vidhi

The affix ड्यण comes in the sense of 'what stays there' after the words 1. पाथस् and 2. नदी , in the छन्दस् (Vedas), whereby the last vowel with the consonant following is elided.

Word by word (padaccheda)

Left context पाथस्- नदीभ्याम् pañcamī · dvivacanaSubstitute / term ड्यण् prathamā · ekavacana

Left context Pañcamī (5th case): "after X", the operation applies to what follows (1.1.67 तस्मादित्युत्तरस्य). Also used for limits and sources.
Substitute / term Prathamā (1st case): in operational rules, the substitute or the thing introduced; in definitions, the term or its referent.

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Full reading

पाथस्-नदीभ्याम् ड्यण्

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

Commentary

The affix ड्यण comes in the sense of 'what stays there' after the words 1. पाथस् and 2. नदी , in the छन्दस् (Vedas), whereby the last vowel with the consonant following is elided.
This debars यत् ॥ Thus पाथसि भवः = पाथ्यः, so also नाद्यः ॥ As in the following hymns : तमुत्वा पाथ्यो वृषा, च नो दधीत नाद्यो गिरो मे ॥ पाथः means firmament.

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