अजाविभ्यां थ्यन्

Operational rule vidhi

The affix थ्यन् comes in the sense of 'good for that' after the words अज and अवि.

Word by word (padaccheda)

Right context अज- अविभ्याम् saptamī · ekavacanaSubstitute / term थ्यन् prathamā · ekavacana

Right context Saptamī (7th case): "when X follows", the operation applies to what precedes (1.1.66 तस्मिन्निति निर्दिष्टे पूर्वस्य). Also a condition or domain ("in the sense of").
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

अज-अविभ्याम् थ्यन्

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

Commentary

The affix थ्यन् comes in the sense of 'good for that' after the words अज and अवि।
This debars 'chha.' Thus अजथ्या यूथिः 'the yellow jasmine called yuthi' अविथ्या यूथिः ॥

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