O字母開頭的單詞或詞組(第19頁)：

• ordering information
• open drain
• on one's own account
• oil bath
• overthrow
• overstress
• overleap
• outwork
• outstretch
• outdoors
• ogee
• object code
• obstinacy
• open source
• ordinary
• on behalf of
• outwalk
• overseen
• overkill
• over-hang
• outerwear
• out of debt
• overtime work
• oxide
• on a basis of
• ocarina
• optimizing
• omega
• Oklahoman
• out of control
• overstep
• octet string
• Oceania
• oddball
• octanoic acid
• octadic
• O. D.
• open gate
• orthodoxy
• overtime
• outer packing
• ouabain