ईद्यति

Operational rule vidhi

The final आ of a अङ्ग (stem) is changed into ई before the कृत् affix यत्.

Word by word (padaccheda)

Substitute / term ईत् prathamā · ekavacanaRight context यति 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

ईत् यति

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

Commentary

The final आ of a अङ्ग (stem) is changed into ई before the कृत् affix यत्।
Thus देयम्, धेयम्, हेयम्, and स्तेयम् ॥ The Guna takes place according to 7.3.84.

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