6.3.53
पद् यत्यतदर्थे
Operational rule vidhi
पद् is substituted for पाद before the affix यत् used in any sense other than that of 'suited there to'.
Word by word (padaccheda)
Substitute / term prathamā · ekavacanaRight context यति saptamī · ekavacanaRight context अतदर्थे saptamī · ekavacana
- Substitute / term Prathamā (1st case): in operational rules, the substitute or the thing introduced; in definitions, the term or its referent.
- 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
यति अतदर्थे
Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.
Commentary
पद् is substituted for पाद before the affix यत् used in any sense other than that of 'suited there to'.
Thus पादौविध्यन्ति = पद्याः शर्कराः, पद्याः कण्टकाः ॥ When यत् has the force of "suited there to" we have पाद्यम् = पादार्थमुदकं ॥ (see 4.4.83 and 5.4.25.
Vart:- Before the affix इक्, in the sense of 'the walks there by', पद is substituted for पाद; as पादाभ्यां चरति = पदिकः 4.4.10 by ष्ठन् affix. The word पाद in this sutra means 'the actual foot', a part of animal organism. Therefore पद् is not substituted before the यत् of 5.1.34, as द्विपाद्यम्, त्रिपाद्यम् because पाद here denotes, 'a measure'.
Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.