वनं समासे

Operational rule vidhi

After a preposition वन has acute accent (उदात्त) on the final in compounds of every kind.

Word by word (padaccheda)

Substitute / term वनम् prathamā · ekavacanaRight context saptamī · ekavacana

Substitute / term Prathamā (1st case): in operational rules, the substitute or the thing introduced; in definitions, the term or its referent.
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").

Dotted words are technical terms. Hover or tap one to see its card.

Full reading

वनम्

Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.

Commentary

After a preposition वन has acute accent (उदात्त) on the final in compounds of every kind.
Thus प्रवणे꣡ यष्टव्यम्, निर्वणे꣡ प्रणिधीयते, the न changed to ण by 8.4.5. The word 'samasa' is used in the sutra to indicate that all sorts of compounds are meant, otherwise only Bahuvrihi would have been meant.

Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.