4.3.121
रथाद्यत्
Operational rule vidhi
The affix यत् comes after रथ in the sense of 'this is his'.
Word by word (padaccheda)
Left context रथात् 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
रथात् यत्
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 रथ in the sense of 'this is his'.
This debars अण् ॥ Thus रथस्येदं = रथ्यम् 'belonging to the chariot -- i.e. wheel or the axle.' The word रथ्य is confined to describe the parts of chariot. This rule applies also to compounds ending with रथ, as, परमरथ्यम्, उत्तमरथ्यम् because of the Vartika रथसीताहलेभ्यो यद्विधौ, after रथ, सीता and हल in applying the affix यत् there is tadanta-vidhi.
Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.