लुक् स्त्रियाम्

Operational rule vidhi

The affix यञ् is लुक् elided in the feminine after the word वतण्डी when meaning a female descendant of अङ्गिरस.

Word by word (padaccheda)

Substitute / term prathamā · ekavacanaRight context स्त्रियाम् 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

स्त्रियाम्

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

Commentary

The affix यञ् is लुक् elided in the feminine after the word वतण्डी when meaning a female descendant of अङ्गिरस।
Thus from वतण्डः we get वातण्ड्य in the masculine. In the feminine the यञ् is elided by luk, and we have वातण्ड्य + ङीन् 4.1.73 = वतण्डी "a female descendant of Vatanda of the clan Angirasa." Why do we say "of Angirasa?" Observe वातंड्यायनी formed with 'shpha' under lohitadi rule 5.1.18. When वतण्ड takes अण् under Sivadi class, its feminine is वातण्डी ॥ Though the word is formed with अण् yet in the feminine, there is not ष्यङ् substitution 4.1.78, because Vatanda is a Rishi-Name.

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