O字母開頭的單詞或詞組(第7頁)：
- odontobothritis
- oaritis
- osteitis fibrosa cystica
- operand coding format
- oblique bandage
- oblatory
- oleum pini pumilionis
- ohmic pseudo-polarization
- optical image
- overcaution
- outstanding drawing
- Oken's body
- osteochondritis vertebral
- os1
- orientation parameter
- overtures
- ordered branch
- off-line file
- octave-band pressure level
- organic intracavitary
- object-centered representation
- oil liver
- open domain
- on margin
- out of tune
- oilseed subproduct
- off sb's mind
- over against
- orthogonalizable code
- oxophenic acid
- outward manifest
- overground
- ortho-silicic acid
- opulence
- olfactory ganglia
- open account scheme
- out to in external bond
- overshot tank filling
- output/cost ratio
- oxidizing column