| Term | Definition |
|---|---|
| Objective |
Perceptible to the external senses, i.e., something the physician uses to quantify, measure, identify. |
| Occlusion |
Blockage of flow. |
| Oncology |
The field of medicine devoted to cancer. |
| Oral |
Taken by mouth. |
| Orchiectomy |
Removal of the testicle(s). |
| Organ |
Tissues in the body that work together to perform a specific function (e.g., heart, bladder, penis). |
| Organic |
|
| Orgasm |
Sexual climax, the culmination of sexual excitement. |
| Orgasmic dysfunction |
Alterations in orgasmic function or inability to achieve an orgasm. |
| Orthostatic hypotension |
The acute lowering of blood pressure when one goes from a sitting or lying position to an upright position (standing). Also called postural hypotension. |