4.1.47
भुवश्च
Operational rule vidhi
The affix ङीष् is always used in the छन्दस् (Vedas) in forming the feminine after the word भु.
Word by word (padaccheda)
Left context भुवः pañcamī · ekavacanaIndeclinable च avyaya
- Left context Pañcamī (5th case): "after X", the operation applies to what follows (1.1.67 तस्मादित्युत्तरस्य). Also used for limits and sources.
- Indeclinable An avyaya such as च "and", वा "optionally", न "not".
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Full reading
भुवः च
Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.
Commentary
The affix ङीष् is always used in the छन्दस् (Vedas) in forming the feminine after the word भु।
Thus विभ्वी, प्रभ्वी, सुभ्वी, शम्भ्वी ॥
But why not so in the case of स्वयभूः? Because it ends in long ऊ, while विभ्वी &c. are feminine of विभु &c. ending in short उ ॥ In fact the word उतः "after a word ending in short उ" of Sutra 4.1.44 governs this also. The word भुवः is the ablative case of भु irregularly formed by the substitution of उवङ्; this form being confined to sutras only.
Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.