4.2.31
वाय्वृतुपित्रुषसो यत्
Operational rule vidhi
The words 'वायु', 'ऋतु', 'पितृ' and 'उषस्' get the प्रत्यय यत् in the meaning of 'सा अस्य देवता'.
Word by word (padaccheda)
Left context वायु- ऋतु- पितृ- उषसः pañcamī · ekavacanaSubstitute / term य 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
वायु-
Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.
Commentary
The affix यत् comes after the names 1. वायु 2. ऋतु 3. पितृ and 4. उषस् in the sense of 'this its deity'.
This debars अण् ॥ As, वायव्यम्, ऋतव्यम्, पित्र्यम् and उषस्यम् ॥ The form पित्र्यम् is thus evolved पितृ + यत् = पित् + रीङ् + यत् 7.4.27 = पित्र्यम् 6.4.148. The पित्र्य has udatta on the first syllable by 6.1.213.
Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.