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hy·per·sen·si·tive / ˌhīpərˈsensitiv/ • adj. abnormally or excessively sensitive, either psychologically or in physical response. DERIVATIVES: hy·per·sen·si·tive·ness n. hy·per·sen·si·tiv·i·ty / -ˌsensiˈtivitē/ n.

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hypersensitive (hy-per-sen-si-tiv) adj. prone to respond abnormally to the presence of a particular antigen, which may cause a variety of tissue reactions ranging from serum sickness to an allergy (such as hay fever) or, at the severest, to anaphylactic shock (see anaphylaxis). See also allergy, immunity.
hypersensitivity n.