Hypersensitivity definitions

Hypersensitivity

1) Allergy 2) Cryaesthesia 3) Cryesthesia 4) Reaction
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hypersensitivity

pathological sensitivity
extreme sensitivity

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Hypersensitivity (also called hypersensitivity reaction or intolerance) refers to undesirable reactions produced by the normal immune system, including allergies and autoimmunity. These reactions may be damaging, uncomfortable, or occasionally fatal. Hypersensitivity reactions require a pre-sensitized (immune) state of the host. They are classifie...
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hypersensitivity

State in which an individual reacts with allergic effects following exposure to a certain substance (
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hypersensitivity

a state of altered reactivity in which the body reacts with an exaggerated immune response to a foreign substance. Hypersensitivity reactions are classified as immediate or delayed, types I and IV, respectively, in the Gell and Coombs classification (q.v.) of immune responses.
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hypersensitivity

acquired bodily state in which the reaction to a stimulus (e.g., a substance causing allergy or a physical agent such as light) is unusually prompt ...
Found on http://www.britannica.com/eb/a-z/h/91

hypersensitivity

An exaggerated response by the immune system to a drug or other substance.
Found on http://www.cancer.gov/dictionary?expand=H

hypersensitivity

See allergy.
Found on http://www.chemicalglossary.net/definition/884-Hypersensitivity

Hypersensitivity

a sharp, sudden painful reaction in teeth when exposed to hot, cold, chemical, mechanical or osmotic (sweet or salt) stimuli.
Found on http://www.cosmeticdentistryguide.co.uk/glossary.html

Hypersensitivity

The condition of being excessively sensitive (overreacting) to the effects of an action or a substance, e.g., the immune system can become hypersensitive to foreign particles such as dust or pollen, which can lead to an allergic reaction. The nervous system may also become hypersensitive to stimulation.
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Hypersensitivity

Excessive sensitivity to certain external factors (over-reaction by immune system causing allergic symptoms).
Found on http://www.encyclo.co.uk/local/20667

hypersensitivity

<immunology> A state of altered reactivity in which the body reacts with an exaggerated immune response to a foreign substance. Hypersensitivity reactions are classified as immediate or delayed, types I and IV, respectively, in the Gell and Coombs classification of immune responses. ... (18 Nov 1997) ...
Found on http://www.encyclo.co.uk/local/20973

hypersensitivity

(hi″pәr-sen″sĭ-tiv´ĭ-te) a state of altered reactivity in which the body reacts with an exaggerated immune response to a foreign agent; anaphylaxis and allergy are two types. The hypersensitivity states and resulting hypersensitivity reactions are usually subclassified by the Gell and Coombs classi...
Found on http://www.encyclo.co.uk/local/21001

Hypersensitivity

State of reactivity to antigen that is greater than normal for the antigenic challenge; hypersensitivity is the same as allergy and denotes a deleterious outcome rather than a protective one.
Found on http://www.encyclo.co.uk/local/21016

Hypersensitivity

Excessive sensitivity of plant tissues to certain pathogens. Affected cells are killed quickly, blocking the advance of obligate parasites. Also an immune reaction, usually harmful to the animal, caused either by antigen-antibody reactions or cellular-immune processes.
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hypersensitivity

In immunology, a state of excessive and potentially damaging immune responsiveness as a result of previous exposure to antigen. If the hypersensitivity is of the immediate type (antibody-mediated), then the response occurs in minutes; in delayed hypersensitivity the response takes much longer (about 24h) and is mediated by primed T-cells. Hypersensitivity responses are not simply divisible into the two types, and it is now more common to subdivide immediate responses into types I, II, and III, the delayed response being of type IV. Type I responses involve antigen reacting with IgE fixed to cells (usually mast cells) and are characterized by histamine release; anaphylactic responses and urticaria are of this type. In type II responses circulating antibody reacts with cell surface or cell-bound antigen, and if complement fixation occurs, cytolysis may follow. In type III reactions immune complexes are formed in solution and lead to damage (serum sickness, glomerulonephritis, Arthus reaction). Delayed-type responses of Type IV involve primed lymphocytes reacting with antigen and lead to formation of a lymphocyte-macrophage granuloma without involvement of circulating antibody. ...
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hypersensitivity

(hi;per-sen;su1-tiv;u1-te) Another name for allergy; abnormal immune response that may be immediate (due to antibodies of the IgE class) or delayed (due to cell-mediated immunity).
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Hypersensitivity

It is an exaggerated reaction of the body’s defence system to basically harmless substances which may have been inhaled, eaten, drunk, injected or just been in contact with the skin.
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