3.3.57
ॠदोरप्
Operational rule vidhi
After a root ending in long ॠ , short उ or long ऊ , there is the affix अप्.
Word by word (padaccheda)
Left context ॠदोः pañcamī · ekavacanaSubstitute / term अ 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
ॠदोः अप्
Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.
Commentary
After a root ending in long ॠ , short उ or long ऊ , there is the affix अप्।
This debars घञ्. The प् is indicatory for the sake of accent 3.1.3; as, कृ + अप् = करः 'scattering'; गॄ--गरः 'beverage, poison'; शॄ--शरः 'arrow'; यु--यवः 'barley'; लू--लवः 'reaping'; पू--पवः 'winnowing corn'.
The द् in ॠद् is merely for the sake of euphony: it is not त् changed into द; for then by the rule 'that which follows त् is also called तपर' short उ only would have been taken and not long ऊ 1.1.70.
Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.