reaction

reaction definition - medical

re·ac·tion (rē-ăkˈshən)

noun
  1. A response of an organism or living tissue to a stimulus.
  2. The state resulting from such a response.
  3. A chemical change or transformation in which a substance decomposes, combines with other substances, or interchanges constituents with other substances.
  4. The response of cells or tissues to an antigen, as in a test for immunization.
  5. A pattern of behavior constituting a mental disorder or personality type.

The American Heritage® Medical Dictionary Copyright © 2009 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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reaction to a tickle47 years ago

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