5.1.87
रात्र्यहस्संवत्सराच्च
Operational rule vidhi
The affix ख optionally in the senses taught in तेन निर्वृत्तम् (5.1.79), द्विगोर्यप् (5.1.82), after the words 1. रात्री 2. अहन् and 3. सम्वत्सर , occasioning a द्विगु समास (Numeral Determinative Compound).
Word by word (padaccheda)
Left context रात्रि- अहः- संवत्सरात् pañcamī · ekavacanaIndeclinable च avyaya
- Left context Pañcamī (5th case): "after X", the operation applies to what follows (1.1.67 तस्मादित्युत्तरस्य). Also used for limits and sources.
- Indeclinable An avyaya such as च "and", वा "optionally", न "not".
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Full reading
रात्रि-
Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.
Commentary
The affix ख optionally in the senses taught in तेन निर्वृत्तम् 5.1.79, द्विगोर्यप् 5.1.82, after the words 1. रात्री 2. अहन् and 3. सम्वत्सर , occasioning a द्विगु समास (Numeral Determinative Compound).
In the alternative ठञ् will also come. Thus द्विरात्रीणः, द्वैरात्रिकः, द्व्यहीनः 6.4.145 or द्वैयह्निकः, द्विसंवत्सरीणः, द्विसांवत्सरिकः 7.3.15.
Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.