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tidsearteachermasculine noun
the
an tidsear
after a preposition
an tidsear
of the
an tidseir
plural
tidsearan
the (plural)
na tidsearan

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.