प्रशंसावचनैश्च

Operational rule vidhi

A case-inflected word denoting a genus (जाति) is compounded with a word denoting praise and the resulting compound is तत्-पुरुष .

Word by word (padaccheda)

With / by प्रशंसा- वचनैः tṛtīyā · bahuvacanaIndeclinable च avyaya

With / by Tṛtīyā (3rd case): accompaniment or means.
Indeclinable An avyaya such as च "and", वा "optionally", न "not".

Dotted words are technical terms. Hover or tap one to see its card.

Full reading

प्रशंसा-वचनैः च

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

Commentary

A case-inflected word denoting a genus (जाति) is compounded with a word denoting praise and the resulting compound is तत्-पुरुष ।
The words denoting praise should be rúdhi (रूढि) words like for &c., which retain their specific gender though used along with words of other genders, in apposition with them, as, गोप्रकाण्डम् 'an excellent cow,' अश्वमतल्लिका 'an excellent horse' गोमचर्चिका 'an excellent cow'. These words are generally used at the end of a compound to denote 'excellence' or 'the best of its kind.'

Why do we say 'when denoting genus?' Observe कुमारी मतल्लिका 'an excellent virgin.'

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