5.2.53
वतोरिथुक्
Operational rule vidhi
When follows is the augment of a stem ending in वतु.
Word by word (padaccheda)
Target वतोः ṣaṣṭhī · ekavacanaSubstitute / term इथुक् prathamā · ekavacana
- Target Ṣaṣṭhī (6th case): names what gets replaced, "in place of X" (1.1.49 षष्ठी स्थानेयोगा).
- Substitute / term Prathamā (1st case): in operational rules, the substitute or the thing introduced; in definitions, the term or its referent.
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Full reading
वतोः इथुक्
Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.
वतोः → इथुक्
Replace vatoḥ with ithuk. Inherited words (anuvṛtti) may add further conditions.
Commentary
When follows is the augment of a stem ending in वतु।
The word डटि is understood here also. The words ending in वतु are Numerals (1.1. 23): and they will take डट् by 5.2.48; the present sutra declares the augment. Thus यावतां पूरणो = यावतिथः, तावतिथः, एतावतिथः ॥
Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.