| ORD | optical rotatory dispersion; oral radiation death |
|---|---|
| OSA | obstructive sleep apnea; Office of Services to the Aging; Optical Society of America; ovarian sectio... |
| AMC | academic medical center; acetylmethyl carbinol; Animal Medical Center; antibody-mediated cytotoxicit... |
| CDC | calculated date of confinement; cancer diagnosis center; capillary diffusion capacity; cell division... |
| CIC | cardioinhibitor center; circulating immune complex; clean intermittent catheterization; completely i... |