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exaggerated allergic reaction to a foreign protein resulting from previous exposure to it.
Historical Examples

What if gout should prove to be a sensitization or anaphylaxis to uric acid that does not exist in the non-gouty?
The Treatment of Hay Fever George Frederick Laidlaw

Foreign protein sensitization or anaphylaxis was the basis of Dr. Rutledge’s coup.
The Sword and the Atopen Taylor H. Greenfield

Recent workers with pollens come near the truth in describing hay fever as an anaphylaxis.
The Treatment of Hay Fever George Frederick Laidlaw

On the basis of these facts it is seen that anaphylaxis is simply another variety of immunity.
The Fundamentals of Bacteriology Charles Bradfield Morrey

The important bearing of anaphylaxis on clinical practice is obvious.
The London Mercury, Vol. I, Nos. 1-6, November 1919 to April 1920 Various

He has added an excellent chapter on “Recent Work on anaphylaxis.”
The London Mercury, Vol. I, Nos. 1-6, November 1919 to April 1920 Various

Viewed in this light the development of immunity to insect bites assumes a place in the larger problem of anaphylaxis.
Handbook of Medical Entomology William Albert Riley

The anaphylaxis theory halts a little at this point and is not exactly clear about the mechanism of that first poisoning.
The Treatment of Hay Fever George Frederick Laidlaw

Another and most interesting phase of my subject is the relation of nut feeding to anaphylaxis.
Northern Nut Growers Association Report of the Proceedings at the Various

The inherited form of hay fever is explained by the well-known transmission of anaphylaxis to the offspring.
The Treatment of Hay Fever George Frederick Laidlaw

noun
extreme sensitivity to an injected antigen, esp a protein, following a previous injection
n.

see anaphylactic.

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.

an’a·phy·lac’tic (-lāk’tĭk) adj.
anaphylaxis
(ān’ə-fə-lāk’sĭs)
See anaphylactic shock.