allergen -
any substance that can cause an allergy
substance the real physical matter of which a person or thing consists; "DNA is the substance of our genes"
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Wiktionary
Substantiv
allergen -
A substance which causes an allergic reaction.
Wikipedia
An allergen is a nonparasitic antigen capable of stimulating a type-I hypersensitivity reaction in atopic individuals. Most humans mount significant Immunoglobulin E (IgE) responses only as a defense against parasitic infections. However, some individuals mount an IgE response against common environmental antigens.
OmegaWiki Dictionary
Ω
allergen Any antigen, such as pollen, a drug, or food, that induces an allergic state in humans or animals.\n(Source: MGH)
