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.

The new mediacal dictionary. 2014.

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

  • 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

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