Medical Dictionary Definitions A-Z List
Medical Dictionary Definitions A - Z - «O»:
Oculodentodigital dysplasia: A genetic disorder that affects many body structures and systems, including the eyes, face, teeth, fingers and toes, and may also cause hearing loss, heart trouble and neurological problems. The disorder is due to mutation (change) in a gene called connexin 43. Also call...
Oculomotor nerve: The oculomotor nerve is the third cranial
nerve. (The cranial nerves emerge from or enter the cranium, the
skull, as opposed to the spinal nerves which emerge from the
The oculomotor nerve is responsible for the nerve supply to
muscles about the eye:
Oculoplastics: Eye plastic and reconstructive surgery., a specialized area of ophthalmology that focuses on the eyelids and the structures surrounding the eye, including problems of the lacrimal (tear) system and the orbit, the region surrounding the eyeball....
OD (lens prescription)
OD (lens prescription): Abbreviation of "oculus dexter." Latin for "right eye." (The words "dexterity" and "dextrous" derive from "dexter" since the right hand is usually more skillful than the left.)
OS stands for "oculus sinister" which is Latin for left eye....
ODD syndrome: Oculodentodigital dysplasia....
Odynophagia: Pain on swallowing food and fluids, a symptom often due to disease of the esophagus. From the Greek roots odyno-, pain + -phagia, from phagein, to eat....
Oesophagus: Alternate spelling for esophagus. The British have an oesophagus while Americans have an esophagus. But on both sides of the Atlantic it is known as the swallowing tube.
Inflammation of this organ is known as esophagitis or oesophagitis:...
Off-label use: In the United States, the regulations of the Food and
Drug Administration (FDA) permit physicians to prescribe approved medications for other
than their intended indications. This practice is known as off-label use....
Off-pump: Not on the pump, usually meaning not on the heart-lung machine. See also: Off-pump surgery....
Off-pump CABG: A coronary artery bypass graft (CABG) done without putting the patient on the heart-lung machine. Off-pump CABG permits surgery on multiple vessels within the heart by mechanically stabilizing it. Off-pump surgery is minimally invasive, as compared to surgery on the heart-lung machine...
Off-pump surgery: A technique for heart surgery designed to avoid use of the heart-lung machine. The technique permits surgery on multiple vessels within the heart by mechanically stabilizing it. Off-pump surgery is minimally invasive, as compared to surgery on the heart-lung machine. The potential ...
Office of Human Research Protections (OHRP)
Office of Human Research Protections (OHRP): The agency responsible for developing, monitoring and exercising compliance over the protections afforded human subjects in all research supported by the US Department of Health and Human Services (DHHS). Formerly called the Office for Protection from Res...
Offspring: The offspring are strictly speaking the progeny, or young, born to a person. In a larger sense, the offspring are collectively all of the descendants, brood or family. For example, the offspring of someone with a genetic (inherited) condition such as Huntington disease are themselves at r...
OGG1: A DNA repair enzyme with antimutator activity. OGG1 is one of a number of enzymes that repair damage done to DNA by environmental mutagens such as those in cigarette smoke. The gene for OGG1 is located on chromosome 3p25. Mutations in OGG1 were first reported in 1999. The OGG1 gene is polymorp...
OHRP: The Office of Human Research Protections, the agency responsible for developing, monitoring and exercising compliance over the protections afforded human subjects in all research supported by the US Department of Health and Human Services (DHHS). Formerly called the Office for Protection from ...