विभाषा छन्दसि

Operational rule vidhi

Optionally so, in the छन्दस् (Vedas), the स्तन after a numeral has acute accent (उदात्त) on the final.

Word by word (padaccheda)

Substitute / term prathamā · ekavacanaRight context छन्दसि saptamī · 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

छन्दसि

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

Commentary

Optionally so, in the छन्दस् (Vedas), the स्तन after a numeral has acute accent (उदात्त) on the final.
Thus द्विस्तना꣡ or द्वि꣡स्तना, चतुःस्तना꣡ or च꣡तुःस्तना ॥

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