Iontrálacha san Fhoclóir Nua Béarla-Gaeilge a bhrabhsáil
- oceanographic
- oceanography
- oceans
- ocelot
- ochre
- octagon
- octagonal
- octahedron
- octal
- octane
- octave
- octavo
- octet
- octogenarian
- octopus
- ocular
- odd
- odd-looking
- oddball
- oddity
- oddly
- oddness
- odds
- odds and ends
- odds-on
- ode
- odious
- odiously
- odiousness
- odium
- odometer
- odontologist
- odontology
- odorous
- odour
- odourless
- odyssey
- oedema
- oenological
- oenologist
- oenology
- oesophagitis
- oesophagus
- oestrogen
- oestrogen patch
- oestrus
- oeuvre
- of
- off
- off air