8.3.93
वृक्षासनयोर्विष्टरः
Operational rule vidhi
The word विष्टर is irregularly formed in the sense of 'tree' and 'seat'.
Word by word (padaccheda)
Right context वृक्ष- आसनयोः saptamī · dvivacanaSubstitute / term विष्टरः prathamā · 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").
- Substitute / term Prathamā (1st case): in operational rules, the substitute or the thing introduced; in definitions, the term or its referent.
Full reading
वृक्ष-
Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.
Commentary
The word विष्टर is irregularly formed in the sense of 'tree' and 'seat'.
This word is formed by adding the affix अप् to the root स्तृ preceded by the preposition वि ॥ Thus विष्टरो वृक्षः ॥ विष्टरमासनम् ॥
Why do we say when meaning a 'tree' or a 'seat'? Observe औलपिवाक्यस्य विस्तरः ॥ See sutra 3.3.33. by which अप् is added here instead of धञ् ॥
Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.