8.2.70
अम्नरूधरवरित्युभयथा छन्दसि
Operational rule vidhi
In the छन्दस् (Vedas), both रु and र् are substituted for the final 1. अमनस् 2. ऊधस् and 3. अवस्.
Word by word (padaccheda)
Word अम्नरूधरवरित्युभयथा Right context छन्दसि saptamī · ekavacana
- Word Case not marked in the source data.
- 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
अम्नरूधरवरित्युभयथा 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), both रु and र् are substituted for the final 1. अमनस् 2. ऊधस् and 3. अवस्।
Thus अम्न एव or अम्नरेव, ऊध एव or ऊधरेव; अव एव or अवरेव ॥ When रु is substituted for the finals, this रु is replaced by य् by 8.3.17, which is elided by 8.3.19. The word अम्नस् means 'a little', and अवस् 'protection'.
Vart:- रु and र both replace the final of प्रचेतस् before राजन्, in the Vedic as well as in the secular language. As प्रचेता राजन् 8.3.14, 6.3.111 प्रचेतो राजन् ॥
Vart:- The words अहर् &c before पति &c should be enumerated. That is, the finals of अहर् &c are replaced by रु or र before पति &c. As. अहर्पतिः or अहᳶपतिः or अहः पतिः, अहर्पुत्रः, अहᳶपुत्रः, अहः पुत्रः, गीर्पतिः, गीः पति, गीᳶपतिः; धूर्पति, धूः पतिः, धूᳵपतिः ॥ Here र् is substituted for the final र् of अहर् &c, which at first sight may appear superfluous. But it is so ordained, in order to prevent the visarga change of this र ॥
Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.