6.3.126
छन्दसि च
Operational rule vidhi
In the छन्दस् (Vedas) also, the long vowel is substituted for the final of अष्टन् before a second member.
Word by word (padaccheda)
Right context छन्दसि saptamī · ekavacanaIndeclinable च avyaya
- 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").
- Indeclinable An avyaya such as च "and", वा "optionally", न "not".
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Full reading
छन्दसि च
Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.
Commentary
In the छन्दस् (Vedas) also, the long vowel is substituted for the final of अष्टन् before a second member.
Thus आग्नेयमष्टाकपालं निर्वपेत्, अष्टाहिरण्या दक्षिणा, अष्टापदी देवता सुमती ॥ The form अष्टापदी is the feminine in ङीप् 4.1.8 of अष्टपात् 5.4.138 the अ of पाद being elided in a Bahuvrihi)), पद् being substituted for पात् by 6.4.130.
Vart:- The final of अष्टन् is lengthened before गो even in the vernacular, when yoking is meant. Thus अष्टागवं शकटम् ॥
Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.