- Overload
- Overnutrition (see also Hyperalimentation) 783.6
- Overproduction - see also Hypersecretion
- Overriding
- Oversize
- Overstimulation, ovarian 256.1
- Overstrained 780.79
- Overweight (see also Obesity) 278.02
- Overwork 780.79
- Oviduct - see condition
- Ovotestis 752.7
- Ovulation (cycle)
- Ovum
- Owren's disease or syndrome (parahemophilia) (see also Defect, coagulation) 286.3
- Ox heart - see Hypertrophy, cardiac
- OX syndrome 758.6
- Oxalosis 271.8
- Oxaluria 271.8
- Oxycephaly, oxycephalic 756.0
- Oxyuriasis 127.4
- Oxyuris vermicularis (infestation) 127.4
- Ozena 472.0
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