1. A substance that causes allergy or dermatitis only after alteration (sensitization) of the skin by previous exposure to that substance. 2. SYN: antibody.
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a) AMBOCEPTOR
b) a substance that sensitizes the skin on first contact so that subsequent contact causes inflammation
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sen·si·tiz·er (senґsĭ-ti″zər) an allergen or irritant that, after an initial sensitizing exposure, produces atopic or contact dermatitis in secondary exposures.Medical dictionary. 2011.