D'fhéadfadh lagiolra nó tréaniolra a bheith ag ainmfhocail.
Nouns can have a weak (lagiolra) or a strong plural (tréaniolra).
Nuair a atá  lagiolra ag ainmfhocal, bíonn an ginideach iolra cosúil leis an ainmneach uatha.
When the noun has a lagiolra, the genitive plural form  is the same as the nominative singular form with an eclipse
Nuair atá tréaniolra ag ainmfhocal bíonn an ginideach iolra cosúil leis an ainmneach iolra.
When the noun has a tréaniolra (strong plural) the genitive plural is the same as the nominative plural with an eclipse

Sa ghinideach:
Nuair a bhíonn lagiolra ag an ainmfhocal úsáidtear an lagiolra den aidiacht.
Nuair a bhíonn tréaniolra ag  an ainmfhocal úsáidtear an tréaniolra den aidiacht ach ní bhíonn aon urú ar an aidiacht.

In the genitive:
When the noun has a weak plural the weak form of the adjective is used .
When the noun has a strong plural the strong plural of the adjective is used but there is nó eclipse on the adjective.