Iontrálacha san Fhoclóir Nua Béarla-Gaeilge a bhrabhsáil
- obligatory
- oblige
- obliged
- obliging
- obligingly
- oblique
- oblique angle
- obliterate
- obliteration
- oblivion
- oblivious
- oblong
- obnoxious
- oboe
- oboist
- obscene
- obscenely
- obscenity
- obscurantist
- obscure
- obscurely
- obscurity
- obsequious
- observable
- observance
- observant
- observation
- observation post
- observational
- observatory
- observe
- observed
- observer
- observing
- obsess
- obsessed
- obsession
- obsessional
- obsessive
- obsessive-compulsive
- obsessive-compulsive disorder
- obsessively
- obsidian
- obsolescence
- obsolete
- obstacle
- obstacle course
- obstacle race
- obstetric
- obstetrician