6.1.24
द्रवमूर्तिस्पर्शयोः श्यः
Operational rule vidhi
There is vocalisation of the semi-vowel of the root श्या (श्यै) 'to go' when the निष्ठा affix follows, when the sense is 'coagulation' or 'cold to touch'.
Word by word (padaccheda)
Right context द्रवमूर्ति- स्पर्शयोः saptamī · dvivacanaTarget श्यः ṣaṣṭhī · ekavacana
- 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").
- Target Ṣaṣṭhī (6th case): names what gets replaced, "in place of X" (1.1.49 षष्ठी स्थानेयोगा).
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Full reading
द्रवमूर्ति-
Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.
Commentary
There is vocalisation of the semi-vowel of the root श्या (श्यै) 'to go' when the निष्ठा affix follows, when the sense is 'coagulation' or 'cold to touch'.
The word द्रवमूर्त्ति means hardening of a fluid, by coagulation &c. Thus शीनं घृतं, शीना वसा, शीनं मेदः "a coagulated butter, grease &c". The त of nishtha is changed to न by 8.2.47. But when the sense is that of 'cold', the त is not changed; as शीतं वर्त्तते, शीतो वायुः, शीतमुदकम् ॥ The word शीत is here used both as a noun meaning 'cold weather &c', and an adjective denoting 'cold'. There is no vocalisation when the sense is not that of 'coagulation' or 'cold', as संश्यानो वृश्चिकः 'the rolled up scorpion'. The short इ is lengthened in शीन &c, by 6.4.2.
Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.