पदमस्मिन् दृश्यम्

Operational rule vidhi

The affix यत् comes in the sense of 'in it is visible' after the word पद being in the Nominative 1st-Case in construction.

Word by word (padaccheda)

Substitute / term prathamā · ekavacanaRight context अस्मिन् saptamī · ekavacanaSubstitute / term दृश्यम् prathamā · 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

अस्मिन् दृश्यम्

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 in the sense of 'in it is visible' after the word पद being in the Nominative 1st-Case in construction.
Thus पद दृश्यमस्मिन् = पद्यः कर्दम 'mud' lit. soft mud in which foot-mark can be seen at every step. It describes mud which is neither very hard nor very fluid, but having sufficient consistency to take the impression of the foot. So पद्याः पांसवः 'dust' for in it also the impression of the foot can be seen. It also means 'the foot-path.' The word दृश्यम् means शक्यते द्रष्टुम् this being the force of the kritya affix 'ya' in दृश ॥

Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.