01 n. Hypersensitivity (to a foreign antigen) resulting from prior contact with the same or a related substance.
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1.
Hypersensitivity (to a foreign antigen) resulting from prior contact with the same or a related substance.(Med.)
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2.
An immediate but transient systemic reaction to an antigenic substance to which a person has become hypersensitized; it is characterized by the contraction of smooth muscle and capillary dilation.(Med.)
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3.
Anaphylactic shock.(Med)