अधिकरणैतावत्त्वे च

Operational rule vidhi

A द्वन्द compound denoting a fixed number (एकत्व) of concrete things (अधिकरण) is not singular.

Word by word (padaccheda)

Right context - एतावत्त्वे saptamī · ekavacanaIndeclinable च avyaya

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").
Indeclinable An avyaya such as च "and", वा "optionally", न "not".

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Full reading

-एतावत्त्वे च

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

Commentary

A द्वन्द compound denoting a fixed number (एकत्व) of concrete things (अधिकरण) is not singular.
As, दश दन्तोष्ठाः 'ten sets of teeth and lips'; दशमार्दङ्गिकपाणविकाः 'ten sets of drum and panavika players.' Compare 2.4.2.

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