verb (used with object), sen·si·tized, sen·si·tiz·ing.

  1. to render sensitive.
  2. Photography. to render (a film or the like) sensitive to light or other forms of radiant energy.
  3. Immunology. to render sensitive to an antigenic substance.

verb (used without object), sen·si·tized, sen·si·tiz·ing.

  1. to become sensitized.


  1. to make or become sensitive
  2. (tr) to render (an individual) sensitive to a drug, allergen, etc
  3. (tr) photog to make (a material) sensitive to light or to other actinic radiation, esp to light of a particular colour, by coating it with a photographic emulsion often containing special chemicals, such as dyes

v.1856, in photography; see sensitive + -ize. Of persons from 1880. Related: Sensitized; sensitizing. v.

  1. To make hypersensitive or reactive to an antigen, such as pollen, especially by repeated exposure.

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