मये च

Operational rule vidhi

The affix य comes in the छन्दस् (Vedas) after the word सोम with the force of मतुप्.

Word by word (padaccheda)

Right context मये saptamī · ekavacanaIndeclinable च avyaya

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").
Indeclinable An avyaya such as च "and", वा "optionally", न "not".

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Full reading

मये च

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

Commentary

The affix य comes in the छन्दस् (Vedas) after the word सोम with the force of मतुप्।
The force of the affix मयट् is that of ततः आगतः 4.3.74 and 4.3.82, विकारावयव 4.3.134 and 4.3.143 and प्रकृत 5.4.21. The case in construction will vary according to the sense. Thus सोम्यं मधुः पिबन्ति = सोममयः मधुः ॥

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