विभाषा घ्राधेट्शाच्छासः

Operational rule vidhi

For the verbs घ्रा, धेट्, शो, छो and सो, the सिच्-प्रत्यय is removed optionally when followed by a प्रत्यय of परस्मैपद.

Word by word (padaccheda)

Substitute / term prathamā · ekavacanaLeft context घ्रा- धेट्- शा- छा- सः pañcamī · ekavacana

Substitute / term Prathamā (1st case): in operational rules, the substitute or the thing introduced; in definitions, the term or its referent.
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

घ्रा-धेट्-शा-छा-सः

Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.

Commentary

After the verbs घ्रा 'to smell', धेट् 'to drink', शा (शो) 'to pare' छा (छो) 'to cut' and सा (सो) 'to destroy' there is optionally the elision of सिच् when the परस्मैपद terminations are used.
Thus अघ्रात् or अघ्रासीत् 'he smelled;' अधात् or अधासीत् 'he drank;' अशात् or अशासीत् 'he pared,' अच्छात् or अच्छासीत् 'he cut' and असात् or असासीत् 'he destroyed.'

There is no option allowed in Atmanepada; thus, अघ्रासातां सुमनसौ देवदत्तेन ॥

The root धेट् is a Ghu verb, and in its case, the सिच् would have been elided by the last rule also. The present declares an option.

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