दध्नष्ठक्

Operational rule vidhi

The word दधि gets the प्रत्यय ठक् in the meaning of संस्कृतं भक्षाः.

Word by word (padaccheda)

Left context दध्नः pañcamī · ekavacanaSubstitute / term 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

दध्नः ठक्

Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.

Commentary

The affix ठक्
Thus दधनि संस्कृतं = दाधिकम् 'made of coagulated milk'. This form will be evolved by 4.4.3, but the दाधिकं formed by that rule means दध्ना संस्कृतं i. e. anything prepared or seasoned with curd; while the दाधिकं of this sutra means 'curd itself seasoned with salt or, pepper'.

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