O字母開頭的單詞或詞組(第3頁)：
- ophthalmotoxin
- ophthalmectomy
- oleum graminis citrati
- Oslo breakfast
- open queuing network
- operational control unit
- overlapped window
- oligolecithal
- operation testing
- occult peak
- occipital triangle
- open porous foaming agent BHK-1
- otoscope
- open registry countries
- ophthalmiac
- occupying tenant
- observe on
- osmotherapy
- one-sided dominance
- off issue
- oxadation
- operation guidance
- oil-line pump
- oil of sperm
- oxalated
- oxam
- overinvoicing
- oleoresin of aspidium
- ochrodermatosis
- ozonize
- obliterative inflammation
- open operation
- overhead monorail
- occlusal
- outpost
- overcanopy
- obtrusion
- offset error
- osmotically
- ooblast