3.2.170
क्याच्छन्दसि
Operational rule vidhi
The affix उ comes in the छन्दस् (Vedas) after the roots that have taken the Denominative affix क्य in the sense of 'agent having such a habit etc.'.
Word by word (padaccheda)
Left context क्यात् pañcamī · ekavacanaRight context छन्दसि saptamī · ekavacana
- Left context Pañcamī (5th case): "after X", the operation applies to what follows (1.1.67 तस्मादित्युत्तरस्य). Also used for limits and sources.
- 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
क्यात् छन्दसि
Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.
Commentary
The affix उ comes in the छन्दस् (Vedas) after the roots that have taken the Denominative affix क्य in the sense of 'agent having such a habit etc.'.
The affix उ comes in the Chhandas, after the roots that have taken the Denominative affix क्य in the sense of 'the agent having such a habit &c'.
The term क्य includes the three affixes क्यच्, क्यङ् and क्यप् (see sutras 3.1.8, (II.13), &c). As मित्रयुः, संस्वेदयुः, सुम्नयुः (Rig. Ved. I.3.4).
In the modern Sanskrit तृन् will be employed. As मित्रीयिता. By sutra 7.4.33, the long ई replaces the final अ, when क्यच् follows; as पुत्र + क्यच् = पुत्री + य = पुत्रीय. Why then in the case of मित्रयुः there is not the substitution of long ई for the अ of मित्र ? Because the rule 7.4.33 is set aside by 7.4.35 which declares that in the Chhandas the long ई is not substituted for the अ ।
Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.