8.2.47
श्योऽस्पर्शे
Operational rule vidhi
The निष्ठा त is changed to न after श्यै but not when the participle denotes 'cold'.
Word by word (padaccheda)
Left context श्यः pañcamī · ekavacanaRight context अस्पर्शे saptamī · 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").
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Full reading
श्यः अस्पर्शे
Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.
Commentary
The निष्ठा त is changed to न after श्यै but not when the participle denotes 'cold'.
Thus शीनं घृतम्, शीनो मेदः, शीना वसा; but शीतं वर्तते, शीतो वायुः, शीतमुदकम् ॥ The य् of श्या is vocalised to ई by 6.1.24.
The prohibition applies when the noun is an adjective and means 'cold'; and not when it means a disease. Therefore we have प्रतिशीनः with न change.
The word स्पर्श is a guna word formed by घञ्, and denotes the particular guna or sensation to be sensed through the organ of touch. In this sense it is derived from the root स्पृश संस्पर्शने ॥ It also denotes a disease, derived from स्पर्श उपतापे ॥ There is nothing to show, what स्पर्श is meant in the sutra. Explanation is the only refuge here.
Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.