[ ĭ-mē′dē-ĭt ]
Hypersensitivity that becomes evident within seconds or minutes after contact with an antigen, reaches its peak within an hour or so, then recedes.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.