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sagartpriestmasculine noun
the
an sagart
after a preposition
an t-sagart
of the
an t-sagairt
plural
sagartan
the (plural)
na sagartan

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.