- osman i
- orthodiagraph
- oesophagoduodenostomy
- oesophageal stenosis
- occipitopontine tract
- on cloud nine
- oxygen toxicity
- oxygen resistance
- over digitalization
- oxygen quotient
- overlay structure
- orthotropia
- ovular haemorrhage
- osteoplastic
- offer namaz
- osteoplastic method
- ophthalmorrhexis
- oil pine
- ossicular fixation
- ophthalmodynamometer
- ophthalmopathy
- on bail
- one who misdirects or propagates ignorance through one's writings
- one who practises butchery through one's pen
- oesophageal telecor
- oesophageal stricture benign,
- one for each
- output queue
- ophthalmomycosis
- oil cake
- open systems interworking
- orbitonometry
- osteochondritis deformans coxac juvenilis
- orotic aciduria
- osteochondrodystrophy
- orthopaedia surgery
- orthopaedic deformity
- orthopaedic department
- ophthalmometry
- osteoplastic craniotomy
- osteoplastic flap
- outclass
- on_line mode
- occipital diploic vein
- oesophageal hiatus hernia
- open question
- oslers disease
- oslar disease
- on part
- one foot in the grave