O字母開頭的單詞或詞組(第1頁)：
- orthodiascope
- occluded gas
- oesophagitis
- oidiomycosis cutis
- on a trial basis
- operation notice
- operation study
- Oklahoman
- open-bite malocclusion
- omphalectomy
- oil supply vessel
- over head and ears
- otosteal
- on inquiry I learnt that...
- Oriental button
- oil cloth
- oil sight glass
- on-line operation
- oxyphenbutazone
- oligergastic
- olikaguria
- oxyhydrogen
- Ostward color cards
- operating and maintenance supplies
- open-end
- oxygenator
- original catalog
- ocular paralyses
- oleol
- oxy-sulfonation
- open mold
- otomycosis aspergillina
- O-ethyl thiocarbamate
- oximate
- oxyphilic element
- oligoleukocytosis
- oscillating damper
- orbicularis phenomenon
- open question
- operation scheduling