- occipital neurectomy
- of disputed origin
- on the cards
- one who can perceive the truth
- one who has realised the supreme truth
- oriental plane
- organ institute
- of high rank
- oxylophytes
- one who files an objection in a court of law
- ophthalmology
- outmaneuver
- outmanoeuvre
- office of naval intelligence
- otitis interna
- on ice
- over the air
- on television
- on the television
- one of the hindi speaking indian states situated in the middle parts of the country adjoining uttar pradesh
- oesophageal dysrhythmia
- ovarian
- oesophageal plexus
- oesophageal diverticulum
- on one's head
- out degree
- oesophageal atresia
- oesophageal obstruction
- on the margin
- obstructive uropathy
- owlish
- owlishly
- overpayment
- of this type
- odorless
- odourless
- outplay
- on approval
- orthonormal analysis
- off line
- osteitis
- osteoplastic amputation
- one who mismanages
- orthogonal basis
- off hand
- one's honour
- output data
- output stream
- output waveform
- output work queue