5.4.99
नावो द्विगोः
Operational rule vidhi
The affix टच् comes after the word नौ when at the end of a द्विगु समास (Numeral Determinative Compound).
Word by word (padaccheda)
Left context नावः pañcamī · ekavacanaLeft context द्विगोः pañcamī · ekavacana
- Left context Pañcamī (5th case): "after X", the operation applies to what follows (1.1.67 तस्मादित्युत्तरस्य). Also used for limits and sources.
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Full reading
नावः द्विगोः
Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.
Commentary
The affix टच् comes after the word नौ when at the end of a द्विगु समास (Numeral Determinative Compound).
Thus द्वे नावौ समाहृते = द्विनावम्, so also त्रिनावम् ॥ Thus द्विनावधनम्, पंचनावप्रियः are also formed. So also द्वाभ्यां नौभ्यामागतं = द्विनावरूप्यम्, द्विनावमयम् 4.3.31.
Why do we say 'when in a Dvigu compound'? Observe राजनौः "the king's ship". The phrase अतद्धितलुकि "when a Taddhita affix is not elided" of sutra 5.4.92 applies here also. Therefore टच् does not apply in पंचभिर्नौभिः क्रीतः = पंचनौः, दशनौः ॥
Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.