चटकाया ऐरक्

Operational rule vidhi

The word चटका takes the affix ऐरक् in forming the Patronymic.

Word by word (padaccheda)

Left context चटकायाः pañcamī · ekavacanaSubstitute / term ऐरक् prathamā · ekavacana

Left context Pañcamī (5th case): "after X", the operation applies to what follows (1.1.67 तस्मादित्युत्तरस्य). Also used for limits and sources.
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

चटकायाः ऐरक्

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

Commentary

The word चटका takes the affix ऐरक् in forming the Patronymic.
Thus चाटकैरः 'son of Chataka'.

Vart:- So also after the masculine word चटक ॥ Thus चाटकैरः 'son of Chataka'.

Vart:- In forming a descendant denoting a female, there is luk-elision of the affix. Thus the female descendant of चटका will be चटका, the टाप् being added as belonging to Ajadi class 4.1.4.

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