8.2.68
अहन्
Operational rule vidhi
The word अहन् gets रुँत्व at पदान्त.
Word by word (padaccheda)
Word अहन्
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Full reading
अहन्
Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.
Commentary
रु is also substituted for the न् of अहन् at the end of a word.
Thus अहोभ्याम्, अहोभिः ॥ The sutra exhibits the form अहन् without the elision of न्, in order to indicate that there is not elision of न् ॥ As दीर्घाहो, निदाघः, हे दीर्घाहोऽत्रेति ॥ See Vartika to 8.2.7. The न् of अहन् is not changed to र् in the sutra by 8.2.69, because it is intended to show the word-form अहन् ॥ The Nominal stem is Pada in the above examples by 1.4.17.
Vart:- Before the words रूप, रात्रि and रथन्तर, the न् of अहन् is changed to र् ॥ As अहोरूपम्, अहोरात्रः, अहोरथन्तरं साम ॥ This is an exception to 8.2.69. Others say, that this र् change takes place universally before all words beginning with र; as अहो रम्यम्, अहो रत्नानि ॥
Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.