ऋत्व्यवास्त्व्यवास्त्वमाध्वीहिरण्ययानि च्छन्दसि

Operational rule vidhi

In the छन्दस् (Vedas) the following are irregularly formed 1. ऋत्व्य 2. वास्त्व्य 3. 4. वास्त्व 5. माध्वी and 6. हिरण्यय.

Word by word (padaccheda)

Substitute / term ऋत्व्य- वास्त्व्य- वास्त्व- माध्वी- हिरण्ययानि prathamā · bahuvacanaRight context छन्दसि 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").

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Full reading

ऋत्व्य-वास्त्व्य-वास्त्व-माध्वी-हिरण्ययानि छन्दसि

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

Commentary

In the छन्दस् (Vedas) the following are irregularly formed 1. ऋत्व्य 2. वास्त्व्य 3.4. वास्त्व 5. माध्वी and 6. हिरण्यय।
The word ऋत्व्य is derived from ऋतु, and वास्त्व्य from वास्तु with the affix यत्, उ being changed to व ॥ ऋतौ भवम् = ऋत्व्यम्, वास्तौ भवम् = वास्त्व्यम् ॥ वास्त्व is from वस्तु, as वस्तुनि भवः = वात्स्वः with the affix अण् ॥ माध्वी from मधु with the affix अण् in the feminine, as माध्वीर्नः सन्त्वोषधीः ॥ हिरण्यय is from हिरण्य with the affix मयट्, there म being elided.

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