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uinneagwindowfeminine noun
the
an uinneag
after a preposition
an uinneag
of the
na h-uinneig
plural
uinneagan
the (plural)
na h-uinneagan

Every form but the headword, the genitive and the plural is worked out by the spelling rules in the grammar guide, so what you see here is what the guide teaches. Awaiting a fluent speaker’s review.