6.3.89
दृग्दृशवतुषु
Operational rule vidhi
स is substituted for समान् before 1. दृग् 2. दृश and the affix वत्.
Word by word (padaccheda)
Right context दृक्- दृश- वतुषु saptamī · bahuvacana
- 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").
Full reading
दृक्-
Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.
Commentary
स is substituted for समान् before 1. दृग् 2. दृश and the affix वत्।
Thus सदृक्, सदृशः ॥ The affixes कञ् and क्विन् are added to दृश् under 3.2.60. Vart:- which give as the forms दृक् and दृश ॥ Vart:-So also before दृक्षः as सदृक्षः ॥ दृक्ष is formed by क्स affix under 3.2.60. Vartika. The affix वतु is taken for the sake of the subsequent sutra.
Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.