6.4.154
तुरिष्ठेमेयस्सु
Operational rule vidhi
The affix तृ is elided before the affixes 1. इष्ठन् 2. इमनिव् and 3. ईयसुन्.
Word by word (padaccheda)
Target तुः ṣaṣṭhī · ekavacanaRight context इष्ठ- इमन्- ईयस्सु saptamī · bahuvacana
- Target Ṣaṣṭhī (6th case): names what gets replaced, "in place of X" (1.1.49 षष्ठी स्थानेयोगा).
- 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
तुः इष्ठ-
Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.
Commentary
The affix तृ is elided before the affixes 1. इष्ठन् 2. इमनिव् and 3. ईयसुन्।
Thus करिष्ठः, विजयिष्ठः, वहिष्ठः, दोहीयसी धेनुः ॥ The whole affix तृ is elided; otherwise only the last vowel (टि) with the following consonant would have been elided by the following rules. The anuvritti of लुक् of the last aphorism should not be read into this, for had the elision taken place by लुक्, then the mark of the affix would also have disappeared likewise 1.1.63, and there would have remained no guna in विजयिष्ठ and करिष्ठ ॥ See 5.1.122, and 5.3.59; for these affixes. The affix इमन् has been read into this aphorism for the sake of the subsequent sutra, there being no example of तृ followed by इमन्; तृ is followed by इष्ठ and ईयस् by 5.3.59.
Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.