- open fracture of acromion of scapula
- open-grained steel
- open-grained timber
- open-grained wood
- open-hearth cinder
- open-hearth fuel
- operating rod arm
- operating rod bearing
- operating rod for driving a switch
- operating rod lever
- operating rod spring
- operating room (or)
- operating room assistant
- operating room covers bucket
- operating room light
- operation-oriented design
- operation-planning system
- operation-word-span test
- operational a
- operational acceptance
- operational accounting
- operational accuracy
- operationally value free
- operationally-configured aircraft
- operations plan
- operations planning and control
- operations planning section
- operations policy
- operations process chart
- operations research analyst
- operations research societies
- operations research society of america
- operationsequencecontrol
- operationsupervisor
- operationsystem
- operative activities
- operative aggregate
- operative associations
- operative attenuation
- operative treatment
- operative treatment of priapism
- operative ultrasonography
- operative weldability
- operative wound
- operatnig incident
- operator (conditional operator)
- opercle
- opercle clip fish tag
- opercula
- opercula insulae
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