8.3.29
डः सि धुट्
Operational rule vidhi
In the context of संहिता, a सकार present after a पदान्त डकार optionally gets a धुट् आगम.
Word by word (padaccheda)
Left context डः pañcamī · ekavacanaRight context सि saptamī · ekavacanaSubstitute / term धुट् prathamā · ekavacana
- Left context Pañcamī (5th case): "after X", the operation applies to what follows (1.1.67 तस्मादित्युत्तरस्य). Also used for limits and sources.
- 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.
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
डः सि धुट्
Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.
Commentary
After a word ending in ड् there may optionally be added the augment ध् to a word beginning with स्।
Thus श्वलिट् त्साये or श्वलिट् साये, or मधुलिट् त्साये or मधुलिट् साये ॥
The word डः is to be construed as Ablative singular, and not Genitive singular of ड्, because of the maxim उभयनिर्देशे पञ्चमी निर्देशो बलीयान् ॥
Question:- Why it is धुट् and not धुक्, in other words, why is this augment added to the beginning of the second word and not to the end of the first ?
Answer:- This is done in order to prevent the ष्टु change by 8.4.41. But being at the beginning of the second word, 8.4.42 would prevent this change. श्वलिट्त् + साये = श्वलिट्ट्साये, 8.4.41 but the correct form is श्वलिट् त्साये ॥ For the ह of श्वलिह् is ढ substituted by 8.2.31, which becomes ड् by 8.2.39, for the ध of the augment, त is substituted by 8.4.55, and for ड् there is ट् by the same rule.
Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.