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Dictionary Suite
allergen any substance capable of causing an allergic reaction.
allergenic capable of causing an allergic reaction.
anaphylaxis extreme allergic reaction to a substance, typically a foreign protein or drug, following a previous exposure to the same substance.
atopic of or relating to a genetic tendency to develop allergic reactions.
atopy a genetic tendency to develop allergic reactions that is typically associated with a heightened immune response to certain allergens.
dander flaky scales of skin, feathers, or fur that may cause allergic reactions. [1/2 definitions]
hay fever an allergic reaction to plant pollen, characterized by mucus from the nose, sneezing, and headache.
histamine an organic crystalline compound, produced esp. during an allergic reaction, that lowers blood pressure, dilates blood vessels, and increases stomach secretions. (Cf. antihistamine.) [1/2 definitions]
hives (used with a sing. or pl. verb) a mild illness characterized by the eruption of small, itchy bumps on the skin, often as an allergic reaction.
hypersensitive sensitive or allergic to something that does not bother most people. [1/2 definitions]
hypoallergenic unlikely to cause an allergic reaction.
nonallergic combined form of allergic.
patch test a test for allergic reaction in which the suspected allergen is applied to the skin on a small piece of cloth and the skin is observed for inflammatory reaction.
rose fever a form of hay fever that occurs in spring or early summer as an allergic reaction to rose pollen.
scratch test a test for allergy in which the skin is scratched and one or more suspected allergens are applied to the scratches, with eventual inflammation indicating an allergic reaction.
urticaria a temporary skin disorder, often caused by an allergic reaction or stress, and characterized by pale, irregular, itching welts; hives.
welt a raised ridge or bump on the skin, caused by a cut or blow, as from a whip, or by an allergic reaction; weal. [1/5 definitions]