6.1.83
भय्यप्रवय्ये च च्छन्दसि
Operational rule vidhi
In the context of Vedas, the words भय्य (the one from which somebody is afraid) and the word प्रवय्या (= a female being impregnated) are seen used (and should thus be considered derived).
Word by word (padaccheda)
Substitute / term भय्य- प्रवय्ये prathamā · dvivacanaIndeclinable च avyayaRight context छन्दसि saptamī · ekavacana
- 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".
- 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").
Dotted words are technical terms, dashed ones pratyāhāras (names for classes of sounds or affixes). Hover or tap one to see its card.
Full reading
भय्य-
Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.
Commentary
The forms भय्य and प्रवय्य are found in the छन्दस
The word भय्य is derived from भी + यत्, and प्रवय्या from प्र + वी + यत् ॥ The guna ए is changed to अय् ॥ Thus भय्यं किलासीत् ॥ वत्सतरी प्रवय्या ॥ The यत् is added to भी with the force of Ablative by virtue of the diversity allowed by कृत्यलुटो बहुलं 3.3.113 ॥ Thus बिभेति अस्माद् = भय्यम् "frightening or fearable". The word प्रवय्या is always used in the feminine: in other places प्रवेय is the proper form. Why do we say 'in the Vedas'? Observe भेयम्, प्रवेयम् in secular literature.
Vart:- The word हृदय्या should also be enumerated when referring to water. As हृदे भवा = हृदय्या आपः ॥ The affix यत् is added by 4.4.110 (हृदे + य = हृदय् + य) ॥
Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.