यजध्वैनमिति च

Operational rule vidhi

यजध्वैनम् is irregularly formed in the छन्दस् (Vedas) for यजध्वनमेनम्.

Word by word (padaccheda)

Substitute / term यजध्वैनम् prathamā · ekavacanaIndeclinable avyayaIndeclinable च avyaya

Substitute / term Prathamā (1st case): in operational rules, the substitute or the thing introduced; in definitions, the term or its referent.
Indeclinable An avyaya such as च "and", वा "optionally", न "not".

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Full reading

यजध्वैनम् च

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

Commentary

यजध्वैनम् is irregularly formed in the छन्दस् (Vedas) for यजध्वनमेनम्।
The word यजध्वम् followed by एनम् loses its final म् in the Veda. As यजध्वैनं प्रियमेधाः (Rig VIII.2.37). The Kasika adds "that व is also irregularly changed into य" : the form would then be यजध्यैनम् ॥ This is, however, a mistake as pointed out by Bhattoji Dikshit.

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