bifreiðaaksturnafnorð karlkynBeygingeintalaán greinismeð greininf.bifreiðaaksturbifreiðaaksturinnþf.bifreiðaaksturbifreiðaaksturinnþgf.bifreiðaakstribifreiðaakstrinumef.bifreiðaakstursbifreiðaakstursinsnf.þf.þgf.ef.