विभाषा विवधवीवधात्

Operational rule vidhi

The affix ष्ठन् optionally comes in the sense of 'he conveys' after the words 1. विवध and 2. वीवध being in the Instrumental -3rd case in construction.

Word by word (padaccheda)

Substitute / term prathamā · ekavacanaLeft context विवध- वीवधात् pañcamī · ekavacana

Substitute / term Prathamā (1st case): in operational rules, the substitute or the thing introduced; in definitions, the term or its referent.
Left context Pañcamī (5th case): "after X", the operation applies to what follows (1.1.67 तस्मादित्युत्तरस्य). Also used for limits and sources.

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Full reading

विवध-वीवधात्

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

Commentary

The affix ष्ठन् optionally comes in the sense of 'he conveys' after the words 1. विवध and 2. वीवध being in the Instrumental -3rd case in construction.
In the altemative, the general affix ठक् will apply. Thus विवधेन हरति = वि꣡वधिकः f. विवधिकी॑; so also वी꣡वधिकः f. वीवधिकी꣡ ॥ When the affix is ठक्, we have वैवधिकः in both cases, the feminine being वैवधिकी꣡ ॥

The word विवध and वीवध are synomyms both meaning 'a piece of wood carried on the shoulders to carry loads, on the road.' विवधिकः meaning 'a carrier of loads, a pedler'. The real sutra is विभाषा विवधात्, the Kasika has added वीवध from a Vartika.

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