optic canal - ovaritis
- oreton
- orexia
- orexigenic
- orf
- organ
- organ culture
- organ differentiation
- organ distribution
- organ donation
- organ graft
- organ of equilibrium
- organ of smell
- organ of taste
- organ of vision
- organ of zuckerkandi
- organ of zuckerkandl
- organ procurement foundation
- organ-activity measurement
- organ-specific antigen
- organa
- organacidia
- organella
- organellae
- organelle
- organi
- organic
- organic acids
- organic dementia
- organic disease
- organic dye
- organic lesion
- organic murmur
- organic nitrate
- organic paralysis
- organic paraplegia
- organic psychosis
- organic psychosyndrome
- organic solvent
- organic solvent extraction
- organic substance