गत्वरश्च

Operational rule vidhi

And the word गत्वर is irregularly formed.

Word by word (padaccheda)

Substitute / term गत्वरः prathamā · ekavacanaIndeclinable च avyaya

Substitute / term Prathamā (1st case): in operational rules, the substitute or the thing introduced; in definitions, the term or its referent.
Indeclinable An avyaya such as च "and", वा "optionally", न "not".

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Full reading

गत्वरः च

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

Commentary

And the word गत्वर is irregularly formed.
The word गत्वर is formed by eliding the म् of गम् and adding the affix क्वरप्. As गत्वरः, fem. गत्वरी 'locomotive, transient'.

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