8.2.64
मो नो धातोः
Operational rule vidhi
A मकार occurring at end of a धातु which in turn occurs at end of a पद is converted to नकार.
Word by word (padaccheda)
Target मः ṣaṣṭhī · ekavacanaSubstitute / term नः prathamā · ekavacanaTarget धातोः ṣaṣṭhī · ekavacana
- Target Ṣaṣṭhī (6th case): names what gets replaced, "in place of X" (1.1.49 षष्ठी स्थानेयोगा).
- Substitute / term Prathamā (1st case): in operational rules, the substitute or the thing introduced; in definitions, the term or its referent.
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Full reading
मः नः धातोः
Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.
मः धातोः → नः
Replace maḥ dhātoḥ with naḥ. Inherited words (anuvṛtti) may add further conditions.
Commentary
न is substituted, at the end of a word, for the final म of a root.
As प्रशान्, प्रतान्, प्रदान् ॥ These are formed by adding क्विप् to the roots शम्, तम् and दम् ॥ The lengthening takes place by 6.4.15. The न् being considered as asiddha is not elided.
Why do we say "of म-ending roots"? Observe भित्, छित् ॥
Why do we say "of a root"? Observe इदम्, किम् ॥
The word पदस्य is understood here also. So we have प्रतामौ, प्रतामः where म is not at the end of a word.
Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.