O (continued)
- ovarian low malignant potential tumor
- ovarian suppression
- ovary
- over-the-counter
- overactive thyroid
- overall survival rate
- overdose
- overexpress
- overgrowth syndrome
- overweight
- ovulation
- OX-40
- OXi-104
- oxidation
- oxidative metabolism
- oxidative stress
- oxide
- oxidize
- oxygen
- oxygen saturation test