Meaning of reagin

re•a•gin

Pronunciation: (rē-ā'jin, -gin), [key]
— n. Immunol.
  1. Also calledan antibody formed in response to syphilis and reactive with cardiolipin in various blood tests for the disease.
  2. an antibody found in certain human allergies, as hay fever and asthma.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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