O字母開頭的單詞或詞組(第6頁)：
- operational differential amplifier
- order for enforcement
- osteogenesis imperfecta
- ovular
- osmolar
- Onchocercosis
- overboard
- oiler
- overdepreciation adjusted
- oxhydryl
- obvious
- object list
- owner's equity statements
- Orbeli effect
- oncotomy
- oxy-hydrogen flame
- obligatory contract
- outgoing record
- overall supervision
- odd-even logic
- obturating embolus
- orbital phlegmon
- orientational disorder
- Oppler-Boas bacillus
- optional pause instruction
- organic circuit
- overabundance
- offence of harbouring criminals
- overhead standard costs
- oddball
- on-line batch processing system
- observability
- oxycalorimeter
- off center
- occasional
- oleum sinapis
- on the fritz
- or else
- optical spectrometer
- ortho-chlorotoluene