उमोर्णयोर्वा

Operational rule vidhi

The affix वुञ् comes optionally in the sense of 'product or part' after the words 1. उमा and 2. ऊर्णा.

Word by word (padaccheda)

Target उमा- ऊर्णयोः ṣaṣṭhī · dvivacanaIndeclinable वा avyaya

Target Ṣaṣṭhī (6th case): names what gets replaced, "in place of X" (1.1.49 षष्ठी स्थानेयोगा).
Indeclinable An avyaya such as च "and", वा "optionally", न "not".

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

उमा-ऊर्णयोः वा

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

The affix वुञ् comes optionally in the sense of 'product or part' after the words 1. उमा and 2. ऊर्णा।
Thus औमम् or औमकम्, और्णम् or और्णकम् ॥

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