6.3.118
वले
Operational rule vidhi
The final of the preceding word is lengthened before the affix वल.
Word by word (padaccheda)
Right context वले saptamī · ekavacana
- 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").
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Full reading
वले
Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.
Commentary
The final of the preceding word is lengthened before the affix वल।
Thus आसुतीवलः, कृषीवलः, दन्तावलः ॥ These are formed by the affix वलच् 5.2.112.
Vart:- Not so, of उत्साह, भ्रातृ and पितृ : as उत्साहवलः, भ्रातृवलः and पितृवलः ॥
Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.