येनाङ्गविकारः

Operational rule vidhi

By whatsoever limb, being defective, is pointed out the defect of the person after that the 3rd case-affix is used.

Word by word (padaccheda)

With / by येन tṛtīyā · ekavacanaSubstitute / term - विकारः prathamā · ekavacana

With / by Tṛtīyā (3rd case): accompaniment or means.
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

येन -विकारः

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

Commentary

By whatsoever limb, being defective, is pointed out the defect of the person after that the 3rd case-affix is used.
As, अक्ष्णा काणः 'blind of one eye' पादेन खंजः 'lame of foot.' पाणिना कुण्ठः &c. The word anga in this sutra applies to the whole body, whatsoever by reason of being a member of the body is defective is indicated here.

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