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| This glossary contains: 19186 medical terms |
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HIV
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HIV Human immunodeficiency virus. Species of lentivirus, subgenus primate lentiviruses (lentiviruses, primate), formerly designated T-cell lymphotropic virus type III/lymphadenopathy-associated virus (HTLV-III/LAV). It is acknowledged to be the agent responsible for the acute infectious manifestations, neurologic disorders, and immunologic abnormalities linked to the acquired immunodeficiency syndrome.
RELATED TERMS--------------------------------------
Virus
Ultramicroscopic infectious agent that replicates itself only within cells of living hosts; many are pathogenic; a piece of nucleic acid (DNA or RNA) wrapped in a thin coat of protein.
T-cell
A white blood cell concerned with immunity. It does not produce antibodies.
Acute
1. Of short course. 2. Severe, but of a short duration. Not chronic.
Acquired
"Anything that is not present at birth but develops some time later. In medicine, the word ""acquired"" implies ""new"" or ""added."" An acquired condition is ""new"" in the sense that it is not genetic (inherited) and ""added"" in the sense that was not present at birth. For example, AIDS (the acquired immune deficiency syndrome) is an acquired form of immune deficiency due to the acquisition of HIV (the human immunodeficiency virus). An acquired mutation is a change in a gene that occurs in a single cell after the conception of the individual. That change is then passed along to all cells descended from that cell. Acquired mutations are involved in the development of cancer."
Syndrome
A grouping of signs and symptoms, based on their frequent co-occurrence, that may suggest a common underlying pathogenesis, course, familial pattern, or treatment selection.
SIMILAR TERMS--------------------------------------
PREVIOUS AND NEXT TERMS--------------------------------------
Haloxazolam
A hypnotic drug.
Haloperidol
An antipsychotic substance.
Hemochromatosis
A disorder due to the deposition of hemosiderin in the parenchymal cells, causing tissue damage and dysfunction of the liver, pancreas, heart, and pituitary. Full development of the disease in women is restricted by menstruation, pregnancy, and lower dietary intake of iron. Acquired hemochromatosis may be the result of blood transfusions, excessive dietary iron, or secondary to other disease. Idiopathic or genetic hemochromatosis is an autosomal recessive disorder of metabolism associated with a gene tightly linked to the A locus of the HLA complex on chromosome 6.
Head injury
Traumatic injuries involving the cranium and intracranial structures. Injuries may be classified by whether or not the skull is penetrated (i.e., penetrating vs. nonpenetrating) or whether there is an associated hemorrhage.
Heartburn
Substernal pain or burning sensation, usually associated with regurgitation of gastric juice into the esophagus.
HIV
Hemorrhoids
Enlarged veins protruding into the anorectal area, either internal or externally visible. They are either the result of poor sphincter tone and portal congestion, or sphincter hypertonicity, skeletal muscle and adrenergic excess.
HLA complex
See 'Major histocompatibility complex'.
H-2 complex
The major histocompatibility complex situated on chromosome 17 of the mouse; contains subregions K, I and D.
Haplotype
A particular combination of closely linked genes on a chromosome inherited from one patient.
Hapten
A compound, usually of low molecular weight, that is not itself immunogenic but that, after conjugation to a carrier protein or cells, becomes immunogenic and induces antibody, which can bind the hapten alone in the absence of carrier.
RELATED TERMS--------------------------------------
Virus
Ultramicroscopic infectious agent that replicates itself only within cells of living hosts; many are pathogenic; a piece of nucleic acid (DNA or RNA) wrapped in a thin coat of protein.
T-cell
A white blood cell concerned with immunity. It does not produce antibodies.
Acute
1. Of short course. 2. Severe, but of a short duration. Not chronic.
Acquired
"Anything that is not present at birth but develops some time later. In medicine, the word ""acquired"" implies ""new"" or ""added."" An acquired condition is ""new"" in the sense that it is not genetic (inherited) and ""added"" in the sense that was not present at birth. For example, AIDS (the acquired immune deficiency syndrome) is an acquired form of immune deficiency due to the acquisition of HIV (the human immunodeficiency virus). An acquired mutation is a change in a gene that occurs in a single cell after the conception of the individual. That change is then passed along to all cells descended from that cell. Acquired mutations are involved in the development of cancer."
Syndrome
A grouping of signs and symptoms, based on their frequent co-occurrence, that may suggest a common underlying pathogenesis, course, familial pattern, or treatment selection.
SIMILAR TERMS--------------------------------------
PREVIOUS AND NEXT TERMS--------------------------------------
Haloxazolam
A hypnotic drug.
Haloperidol
An antipsychotic substance.
Hemochromatosis
A disorder due to the deposition of hemosiderin in the parenchymal cells, causing tissue damage and dysfunction of the liver, pancreas, heart, and pituitary. Full development of the disease in women is restricted by menstruation, pregnancy, and lower dietary intake of iron. Acquired hemochromatosis may be the result of blood transfusions, excessive dietary iron, or secondary to other disease. Idiopathic or genetic hemochromatosis is an autosomal recessive disorder of metabolism associated with a gene tightly linked to the A locus of the HLA complex on chromosome 6.
Head injury
Traumatic injuries involving the cranium and intracranial structures. Injuries may be classified by whether or not the skull is penetrated (i.e., penetrating vs. nonpenetrating) or whether there is an associated hemorrhage.
Heartburn
Substernal pain or burning sensation, usually associated with regurgitation of gastric juice into the esophagus.
HIV
Hemorrhoids
Enlarged veins protruding into the anorectal area, either internal or externally visible. They are either the result of poor sphincter tone and portal congestion, or sphincter hypertonicity, skeletal muscle and adrenergic excess.
HLA complex
See 'Major histocompatibility complex'.
H-2 complex
The major histocompatibility complex situated on chromosome 17 of the mouse; contains subregions K, I and D.
Haplotype
A particular combination of closely linked genes on a chromosome inherited from one patient.
Hapten
A compound, usually of low molecular weight, that is not itself immunogenic but that, after conjugation to a carrier protein or cells, becomes immunogenic and induces antibody, which can bind the hapten alone in the absence of carrier.
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This dictionary contains 19186 terms.
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