Medical Dictionary Definitions A-Z List
Medical Dictionary Definitions A - Z - «O»:
Oil, tropical: Coconut, palm kernel or palm oil. Like all fats and oils, these three oils contain various types of fatty acids but, unlike other plant oils, they contain a great deal of saturated fatty acids. Coconut oil is 92%, palm kernel oil 82% and palm oil 50% saturated fat. These oils are foun...
Ointment: A medication preparation that is applied topically (onto the skin). An ointment has an oil base whereas a cream
is water-soluble. (The word ointment comes from the Latin ungere meaning anoint with oil).
Okihiro syndrome: The association of Duane syndrome (eye retraction) with forearm malformation and deafness. Okihiro syndrome is inherited in an autosomal dominant manner and is due to mutation of a gene located in chromosome region 20q13.13-q13.2. Also known as the Duane-radial ray syndrome, DRRS, ...
OKT3: Brand name for muromonab-CD3, an immunosuppressant drug given intravenously to reverse acute rejection of transplanted organs, including the heart, kidneys and liver. OKT3 was the first monoclonal antibody used to treat patients.
OKT3 acts by blocking the function of T cells which play a majo...
Olecranon: Of or pertaining to the bony tip of the elbow. The olecranon is, in fact, the near end of the ulna, the bone in the forearm, that forms the pointed portion of the elbow.
The triceps muscle tendon of the back of the arm attaches to the olecranon.
Disease can affect the olecranon. For examp...
Olefaction: Common misspelling of olfaction....
Olefactory: Common misspelling of olfactory....
Olfaction: The sense of smell, part of the chemical sensing system, or the chemosenses. Sensory cells in the nose, mouth, and throat have a role in helping interpret smells and taste flavors. Microscopic molecules released by substances (foods, flowers, etc.) stimulate these sensory cells. Once the ...
Olfactory: Pertaining to olfaction, the sense of smell....
Olfactory apparatus: The entire system needed to have a sense of smell. This system involves at least 1,000 genes for the olfactory receptors. These genes are members of a large family of genes that encode signaling proteins required for the detection and discrimination of odors. Many of these olfac...
Olfactory bulb: A key part of the olfactory apparatus consisting of a bulbous enlargement of the end of the olfactory nerve on the under surface of the frontal lobe of each cerebral hemisphere just above the nasal cavity. Called also Morgagni's tubercle....
Olfactory disorder: A loss in the ability to smell or a change in the way odors are perceived. Reduction of the sense of smell is termed hyposmia. Total inability to detect odors is termed anosmia. As for changes in the perception of odors, some people notice that familiar odors become distorted. O...
Olfactory nerve: A nerve that registers smells by carrying the impulses for the sense of smell from the nose to the brain. Olfactory nerves continually regenerate -- through all of childhood and adulthood. The olfactory nerves are the only nerves in the human body known to possess this remarkable ca...
Olfactory system: See: Olfactory apparatus....
Oligo- (prefix): Means just a few or scanty.
From the Greek "oligos', few, scanty. Examples of terms starting with
oligo- include oligodactyly (few fingers), oligohydramnios (too
little amniotic fluid) and oligospermia (too few sperm)....