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Allergy

Allergy :

Allergy definitions from around the web

 

Allergy: Merriam-Webster

al·ler·gy

noun \ˈa-lər-jē\

plural al·ler·gies

Definition of ALLERGY

1
: altered bodily reactivity (as hypersensitivity) to an antigen in response to a first exposure <a bee venom allergy so severe that a second sting may be fatal>
2
: exaggerated or pathological immunological reaction (as by sneezing, difficult breathing, itching, or skin rashes) to substances, situations, or physical states that are without comparable effect on the average individual
3
: medical practice concerned with allergies
4
: a feeling of antipathy or aversion

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Examples of ALLERGY

  1. Many people have some form of allergy.
  2. <independent-minded people who seem to have an allergy to any control from the government>

Origin of ALLERGY

German Allergie, from all- + Greek ergon work — more at work

First Known Use: 1910

 

 

Allergy: Dictionary.com

al·ler·gy

/ˈælərdʒi/  Show Spelled[al-er-jee]  Show IPA

–noun, plural -gies.

1.

an abnormal reaction of the body to a previously encountered allergen introduced by inhalation, ingestion, injection, or skin contact, often manifested by itchy eyes, runny nose, wheezing, skin rash, or diarrhea.

2.

hypersensitivity to the reintroduction of an allergen. Compare anaphylaxis.

3.

Informal . a strong dislike or aversion, as toward a person or activity: He has an allergy to hard work.
Allergies
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Origin:
1910–15;  < Greek áll ( os ) other + -ergy  < Greek -ergia,  equivalent to érg ( on ) activity + -ia -y3
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2011.
Cite This Source 


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World English Dictionary
allergy (ˈælədʒɪ)
n , pl -gies
1. a hypersensitivity to a substance that causes the body to react to any contact with that substance. Hay fever is an allergic reaction to pollen
2. informal aversion: he has an allergy to studying
[C20: from German Allergie (indicating a changed reaction), from Greek allos other + ergon activity]
Collins English Dictionary – Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
Word Origin & History

allergy

1911, from Ger. Allergie,  coined 1906 by Clemens E. von Pirquet (1874-1929), Austrian pediatrician, from Gk. allos  “other, different, strange” (from PIE *al-  “beyond;” see alias) + ergon  “activity” (see urge (v.)).

Online Etymology Dictionary, © 2010 Douglas Harper

Medical Dictionary

al·ler·gy definition

Pronunciation:  /ˈal-ər-jē/
Function: n
pl -gies ; 1 : altered bodily reactivity (as hypersensitivity) to an antigen in response to a first exposure bee-venom allergy may render a second sting fatal>
2 : exaggerated or pathological reaction (as by sneezing, respiratory embarrassment, itching, or skin rashes) to substances, situations, or physical states that are without comparable effect on the average individual
3 : medical practice concerned with allergies

Merriam-Webster’s Medical Dictionary, © 2007 Merriam-Webster, Inc.

allergy al·ler·gy (āl’ər-jē)
n.
An abnormally high acquired sensitivity to certain substances, such as drugs, pollens, or microorganisms, that may include such symptoms as sneezing, itching, and skin rashes.

The American Heritage® Stedman’s Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company. 

Science Dictionary
allergy (āl’ər-jē) Pronunciation Key
An abnormally high immunologic sensitivity to certain stimuli such as drugs, foods, environmental irritants, microorganisms, or physical conditions, such as temperature extremes. These stimuli act as antigens, provoking an immunological response involving the release of inflammatory substances, such as histamine, in the body. Allergies may be innate or acquired in genetically predisposed individuals. Common symptoms include sneezing, itching, and skin rashes, though in some individuals symptoms can be severe. See also anaphylactic shock.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved. 

Cultural Dictionary

allergy definition

A highly sensitive reaction of the body to certain substances, such as pollen, that are present in amounts that do not affect most people. Common indications of allergy include sneezing, skin rashes, itching, and runny nose.

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.

 

 

Allergy: Wikipedia

Allergy is a hypersensitivity disorder of the immune system.[1] Allergic reactions occur to normally harmless environmental substances known as allergens; these reactions are acquired, predictable, and rapid. Strictly, allergy is one of four forms of hypersensitivity and is called type I (or immediate) hypersensitivity. It is characterized by excessive activation of certain white blood cells called mast cells and basophils by a type of antibody known as IgE, resulting in an extreme inflammatory response. Common allergic reactions include eczema, hives, hay fever, asthma attacks, food allergies, and reactions to the venom of stinging insects such as wasps and bees.[2]

Mild allergies like hay fever are highly prevalent in the human population and cause symptoms such as allergic conjunctivitis, itchiness, and runny nose. Allergies can play a major role in conditions such as asthma. In some people, severe allergies to environmental or dietary allergens or to medication may result in life-threatening anaphylactic reactions.

A variety of tests now exist to diagnose allergic conditions; these include testing the skin for responses to known allergens or analyzing the blood for the presence and levels of allergen-specific IgE. Treatments for allergies include allergen avoidance, use of anti-histamines, steroids or other oral medications, immunotherapy to desensitize the response to allergen, and targeted therapy.

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