- exaggerated allergic reaction to a foreign protein resulting from previous exposure to it.
- extreme sensitivity to an injected antigen, esp a protein, following a previous injection
n. pl. an•a•phy•lax•es (-lăk′sēz)
- Hypersensitivity induced by preliminary exposure to a substance and usually producing a contraction of smooth muscle and a dilation of blood vessels.
- anaphylactic shock
- See anaphylactic shock.