O字母開頭的單詞或詞組(第18頁)：

• oesophagus
• on time
• ophthalm-
• outdone
• outside loop
• overpay
• overside
• over all
• out of range value
• ours
• overwritten
• orchid
• organist
• odontectomy
• of oneself
• oblate
• oath of allegiance
• omnibus
• organized
• outpace
• outcast
• order nisi
• ordinal
• opus
• oleum cari
• OA
• off color
• offer sheet
• oxalic acid
• obligations under capital leases
• one by one
• osmosis
• onlay
• olio
• obelisk
• outflow
• outlaw
• overcall
• overscan
• on the assumption that
• organizing
• opuntia