Glossary O's


Definition:gas that is colorless, odorless, and tasteless; essential to almost all forms of life


Definition:condition in which there is an excess of body fat; used to describe those who weigh at least twenty percent more than the maximum amount considered normal for their age, sex, and height

obstructive sleep apnea

Definition:blockage of the airways during sleep, which causes breathing to stop for very short periods of time, commonly caused by excessive relaxation of muscles at the back of the throat


Definition:branch of medicine dealing with the care of women during pregnancy, childbirth and the period of recovery from childbirth

occupational disease

Definition:disease that occurs as a result of factors in the workplace

occupational therapy

Definition:treatment to relearn physical skills lost as a result of an illness or accident


Definition:blocking of an opening or passageway in the body

occult blood

Definition:blood in the feces that can be detected only by chemical tests


Definition:pertaining to the eyes


Definition:excessively large dose of a drug, which can lead to coma and death


Definition:the study, diagnosis and treatment of diseases that cause cancer


Definition:the study, diagnosis and treatment of diseases that cause cancer


Definition:surgical removal of one or both ovaries; used to treat the growth of ovarian cysts or tumors

open heart surgery

Definition:any operation in which the heart is stopped temporarily and a machine is used to take over its function of pumping blood throughout the body

opportunistic infections

Definition:infection by organisms that would be harmless to a healthy person, but cause infection in those with a weakened immune system (for example, persons with AIDS or chemotherapy patients)


Definition:branch of medicine dealing with the study, diagnosis and treatment of the eye and related disorders


Definition:examination of the inside of the eye using a lighted viewing instrument


Definition:pertaining to the eyes


Definition:descriptive of being given through or involving the mouth; adverb form is orally


Definition:socket in the skull that contains the eyeball, along with its blood vessels, nerves, and muscles

organ donation

Definition:agreement to allow one or more organs to be removed and transplanted into someone else


Definition:any single, functioning form of life


Definition:device used to correct or control deformed bones, muscles, or joint


Definition:comprised of, resembling or capable of forming bone


Definition:disease that breaks down the cartilage that lines joints, especially weight-bearing or malaligned joints; leads to inflammation, pain, and stiffness; also called degenerative arthritis


Definition:inflammation of bones and bone marrow because of an infection, usually caused by bacteria


Definition:disease of bone


Definition:operation or process by which total or partial loss of a bone is remedied


Definition:condition in which bones lose calcium and become less dense, more brittle, and fracture easilycondition in which bones lose calcium and become less dense, more brittle, and fracture easily


Definition:cancerous bone tumor


Definition:procedure to create an opening from an area inside the body to the outside

otitis media

Definition:inflammation of the middle ear (between the eardrum and inner ear) due to the spread of an infection from the nose, sinuses, and throat


Definition:discharge from an inflamed ear


Definition:harmful effect that some drugs have on the organs or nerves in the ears, which can lead to hearing and balance problems


Definition:breathing difficulty experienced while lying flat; can be a symptom of heart failure or asthma

outcome prediction model

Definition:computerized scoring system for prediction of outcomes of illness/injury situations; two specific outcome prediction models are MPM and APACHE


Definition:two almond-shaped glands located at the opening of the fallopian tubes on both sides of the uterus; produce eggs and the sex hormones estrogen and progesterone


Definition:determination of the amount of oxygen in the blood by measuring the amount of light transmitted through an area of skin


Definition:type of hemoglobin which causes blood to be red, indicating the presence of adequate amounts of oxygen in the blood; if the blood is blue, it indicates that there is less oxygen in the blood


Definition:used to describe medical observation and treatment provided to a patient who has not been hospitalized (i.e., admitted to and staying in the hospital or medical facility); also called ambulatory care; also, a patient who has not been hospitalized