6.1.88
वृद्धिरेचि
Operational rule vidhi
When an अवर्ण is followed by an एच् letter in the context of संहिता, both of them are replaced by a single वृद्धि letter.
Word by word (padaccheda)
Substitute / term prathamā · ekavacanaRight context saptamī · ekavacana
- Substitute / term Prathamā (1st case): in operational rules, the substitute or the thing introduced; in definitions, the term or its referent.
- 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
Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.
Commentary
The वृद्धि is the single substitute of अ or आ of a preceding word and the initial diphthong of the succeeding (अ or आ + diphthong = वृद्धि)।
The word आत् is understood here. For the diphthong which follows an अ or आ, and for the अ or आ which precedes a diphthong, in the room of both these preceding and succeeding आ or आ and diphthong, there is a single substitute viz., the Vriddhi. This debars guna taught in the last sutra. Thus ब्रह्म + एडका = ब्रह्मैडका, खट्वा + एडका = खट्वैडका, ब्रह्म + ऐतिकायनः = ब्रह्मैतिकायनः, खट्वा + एतिकायनः = खट्वैतिकायनः ॥ ब्रह्म + ओदनः = ब्रह्मौदनः, खट्वा + ओदनः = खट्वौदनः, ब्रह्म + औपगवः = ब्रह्मापगवः, खट्वा + औपगवः = खट्वौपगवः ॥
Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.