Allergen
A substance that is foreign to the body and can cause an allergic reaction in certain people. For examples, pollen, dander, mold.
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Term for an antigen that induces an allergic or hypersensitive response. [allergy + G. -gen, producing]

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al·ler·gen 'al-ər-jən n a substance that induces allergy <inhaled \allergens> <a suspected food \allergen>

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n.
any antigen that causes allergy in a hypersensitive person. Allergens are diverse and affect different tissues and organs. Pollens, fur, feathers, mould, and dust may cause hay fever; house-dust mites (see Dermatophagoides) have been implicated in some forms of asthma; drugs, dyes, cosmetics, and a host of other chemicals can cause rashes and dermatitis; some food allergies may cause diarrhoea or constipation or simulate acute bacterial food poisoning. When a patient's allergen has been identified (see patch test), it may be possible to attempt desensitization to alleviate or prevent allergic attacks.
allergenic adj.

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al·ler·gen (alґər-jən) [allergy + -gen] an antigenic substance capable of producing immediate-type hypersensitivity (allergy).

Medical dictionary. 2011.

Look at other dictionaries:

  • Allergen — (n) eng allergen, sensitiser, sensitising agent …   Arbeitssicherheit und Gesundheitsschutz Glossar

  • allergen — (n.) substance causing allergy, 1912, from ALLERGY (Cf. allergy) on model of ANTIGEN (Cf. antigen) …   Etymology dictionary

  • allergen — [n] irritant antigen, dander, dust mite, foreign substance, immune trigger, irritant, pollen, ragweed; concept 478 …   New thesaurus

  • allergen — ► NOUN ▪ a substance that causes an allergic reaction …   English terms dictionary

  • allergen — ☆ allergen [al′ər jən, al′ərjen΄ ] n. [Ger < allergie, ALLERGY + gen, GEN] a substance inducing an allergic state or reaction allergenic [al΄ərjen′ik] adj …   English World dictionary

  • Allergen — An allergen is any substance that can cause an allergy. In technical terms, an allergen is a non parasitic antigen capable of stimulating a type I hypersensitivity reaction in atopic individuals.[1] Most humans mount significant Immunoglobulin E… …   Wikipedia

  • Allergen — Ein Allergen (griechisch αλλεργενικό – das allergieerzeugende) ist eine Substanz, die über Vermittlung des Immunsystems Überempfindlichkeitsreaktionen auslöst. Ein Allergen ist ein Antigen, die von ihm verursachte Überempfindlichkeitsreaktion des …   Deutsch Wikipedia

  • allergen — UK [ˈælə(r)ˌdʒen] / US [ˈælərdʒən] noun [countable] Word forms allergen : singular allergen plural allergens medical a substance that produces an allergic reaction in someone …   English dictionary

  • allergen — [[t]æ̱lə(r)ʤen[/t]] allergens N COUNT An allergen is a substance that causes an allergic reaction in someone. [TECHNICAL] …   English dictionary

  • allergen — n. any antigen that causes allergy in a hypersensitive person. Allergens are diverse and affect different tissues and organs. Pollens, fur, feathers, mould, and dust may cause hay fever; house dust mites (see Dermatophagoides) have been… …   The new mediacal dictionary

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