अङ्गानि मैरेये

Operational rule vidhi

The first syllable of the word preceding मैरेय gets the acute accent (उदात्त) when it denotes the ingredient of the same.

Word by word (padaccheda)

Substitute / term prathamā · bahuvacanaRight context मैरेये 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

मैरेये

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

Commentary

The first syllable of the word preceding मैरेय gets the acute accent (उदात्त) when it denotes the ingredient of the same.
Thus गु꣡डमैरेयः 'the wine maireya prepared from treacle or molasses'. म꣡धुमैरेयः 'the maireya prepared from honey'. Why do we say when denoting 'an ingredient?' Observe परममैरयः꣡ ॥ Why do we say "before मेरेय?" Observe पुष्पासवः꣡ ॥ Every sort of spirituous liquor except सुरा is called मैरेय ॥

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