open - over
- open flame
- open timbering
- open-circuit respiratory equipment
- opening poling
- operating error
- operating fault
- ophthalmological examination
- ophthalmoscopy
- opposing-torque brake
- optical flicker-fusion frequency
- optical smoke detector
- ornithosis
- oscillographic polarography
- OSH
- osteochondritis dissecans
- osteogenic sarcoma
- osteosarcoma
- otosclerosis
- outburst
- outlet silencer
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