8.2.61 नसत्तनिषत्तानुत्तप्रतूर्तसूर्तगूर्तानि छन्दसि

Word by word (padaccheda)

Substitute / term नसत्तनिषत्तानुत्तप्रतूर्तसूर्तगूर्तानि prathamā · bahuvacanaRight 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

नसत्तनिषत्तानुत्तप्रतूर्तसूर्तगूर्तानि छन्दसि

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

Commentary

In the छन्दस् (Vedas) we have the following irregular participles - 1. नसत्त 2. निषत्त 3. अनुत्त 4. प्रतूर्त 5. सूर्त्त and 6. गूर्त्त।
The words नसत्त and निषत्त are derived from the root सद् preceded by न and नि, and there is not the न change of 8.2.42. Thus नसत्तमञ्जसा ॥ In secular literature we have नसन्नम् ॥ So also निषत्तः in the Vedas, but निषण्णः in secular literature. The word अनुत्तः is from उन्द with the negative अन् ॥ The option of 8.2.56 does not apply here. As अनुत्तमा ते मघवन् (= अनुन्नम्) ॥ प्रतूर्त्तम् is from त्वर् or तूर्व, as प्रतूर्त्तं वाजिनम् (= प्रतूर्णम्) ॥ When it is derived from त्वर् then ऊठ् is added by 6.4.20; and when from तूर्व then 6.4.21 is applied. सूर्त्ते is from सृ, the ऋ is changed to उ irregularly, as सूर्त्तागावः = सृतागावः ॥ गूर्त्तं is from गूर्, as गूर्त्ता अमृतस्य (= गूर्णे) ॥

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