टाबृचि

Operational rule vidhi

The affix ङीप् is used in the feminine after a प्रातिपदिक (Nominal Stem) ending with the word पाद् when the word denotes a verse of the ऋग्वेद.

Word by word (padaccheda)

Substitute / term आ prathamā · ekavacanaRight context ऋचि 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

टाप् ऋचि

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Commentary

The affix ङीप् is used in the feminine after a प्रातिपदिक (Nominal Stem) ending with the word पाद् when the word denotes a verse of the ऋग्वेद।
This debars ङीप् ॥ Thus द्विपदा ऋक् 'a Rik verse consisting of two quarter verses'; similarly त्रिपदा ऋक्, चतुष्पदा ऋक् ॥ Why do we say "when denoting a ' Rik' verse" ? Observe द्विपदी देवदत्ता 'Devadatta (a woman) having two feet'.

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