Glossary of Terms
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- occluded
- Blocked.
- occult
- Occult injuries and disease are hidden, difficult to see or unaccompanied by readily discernible signs and symptoms.
- oncologic
- Relating to oncology, the study of cancer and the branch of medicine devoted to the diagnosis and treatment of cancer.
- oncologist
- (ong-kol-O-jist)
- A specialist in oncology.
- oncology
- (ong-kol-O-jE)
- The study or science dealing with the physical, chemical, and biologic properties and features of neoplasms (abnormal tissue growth or cancer), including causation, pathogenesis, and treatment.
- opaque
- (O-pAk)
- Impervious to light or radiation; not transparent or only slightly so.
- optionally retrievable filters
- A device that is temporarily implanted in and then removed from the
inferior vena cava, the large vein that returns blood from the legs to the heart, to prevent blood clots in the lower body from traveling to the heart or lungs.
- orbit
- The bony cavity containing the eyeball.
- orthodontic
- To prevent and correct teeth irregularities.
- orthopaedics
- (or-thO-pEd-ics)
- The medical specialty concerned with the preservation, restoration, and development of form and function of the musculoskeletal system, extremities, spine, and associated structures by medical, surgical, and physical methods.
- orthopedic cement
- An acrylic cement such as polymethylmethacrylate (PMMA) used to repair bone fractures and in other orthopedic surgeries.
- osmosis
- Movement of a solution through the membrane of a cell.
- osteoarthritis
- A common condition that usually starts in middle age and is characterized by degenerative changes in the bone and cartilage of one or more joints.
- osteomyelitis
- (os-tE-O-mI-e-LI-tis)
- Bone infection.
- osteopenia
- Reduction in bone mineral density to below-normal levels; the first stage of bone loss; an early-warning sign pointing to an increased risk of developing full-blown osteoporosis.
- osteoporosis
- (os-tE-O-pOr-O-sis)
- A condition of reduced bone mass, with decreased outer thickness and a decrease in the number and size of the spongy structures in the bone (but normal chemical composition), resulting in increased fracture incidence. Osteoporosis is primarily classified as an age-related decline in bone mineral density. Secondary osteoporosis results from an identifiable disease (for example, diseases of the parathyroid glands, or, for instance, certain medications). See the Osteoporosis page for additional information.
- ovary
- One of two female reproductive glands that contain the ova, or eggs, that are released during ovulation; the fallopian tubes connect the ovaries and the uterus.
- ovulation
- The release of an ovum, or egg, from the ovary, which then travels through the fallopian tube to the uterus to be fertilized by a sperm
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