O 开头单词
ogallala n.奥加拉拉(在美国；西经 101º44' 北纬 41º09')
ofwat n.供水部
ofuro n.(日本人用的)大浴盆；大浴桶
ofuranodiene 四氢三甲基环癸并呋喃
ofu 远敷
oftware 软件
ofttimes adv.时常=oftentimes.
oftstated adj.常说的
oftrepeated adj.多次重复的
oftline-programming 离线编程系统
oftimes adv. =often
ofthodontics 正牙术
oftentimes adv.屡次；常常=ofttimes.
oftenness n.频率
oftenest adv.经常；时常；屡次
oftener adv.经常；时常；屡次
often-ailing n.多病的