anaphylaxis an·a·phy·lax·is (ān'ə-fə-lāk'sĭs)
n. pl. an·a·phy·lax·es (-lāk'sēz)
Hypersensitivity induced by preliminary exposure to a substance and usually producing a contraction of smooth muscle and a dilation of blood vessels.
See anaphylactic shock.
Dictionary.com presents 366 FAQs, incorporating some of the frequently asked questions from the past with newer queries.