anaphylaxis

ana·phy·lax·is

noun \-ˈlak-səs\

plural ana·phy·lax·es\-ˌsēz\

Definition of ANAPHYLAXIS

1

: hypersensitivity (as to foreign proteins or drugs) resulting from sensitization following prior contact with the causative agent

2

: anaphylactic shock

Origin of ANAPHYLAXIS

New Latin, from ana- + prophylaxis

First Known Use: 1907

ana·phy·lax·is

noun \ˌan-ə-fə-ˈlak-səs\   (Medical Dictionary)

plural ; ana·phy·lax·es \-ˌsēz\ (audio pronunciation)

Medical Definition of ANAPHYLAXIS

1

: hypersensitivity (as to foreign proteins or drugs) resulting from sensitization following prior contact with the causative agent

2

: anaphylactic shock

anaphylaxis

noun    (Concise Encyclopedia)

Severe, immediate, potentially fatal bodily reaction to contact with a substance (antigen) to which the individual has previously been exposed. Often triggered by antiserum, antibiotics, or insect stings, the reaction's symptoms include skin flushing, bronchial swelling (with difficulty breathing), and loss of consciousness. Shock may follow. Milder cases may involve hives and severe headache. Treatment, consisting of injection of epinephrine, followed by antihistamines, cortisone, or similar drugs, must begin within minutes. Anaphylaxis may be caused by extremely small amounts of antigen.