barrier

barrier definition - medical

bar·ri·er (bărˈē-ər)

noun
  1. A boundary or limit.
  2. An obstacle or impediment.
  3. Something that separates or holds apart.
  4. Something immaterial that obstructs or impedes behavior.
  5. A physical or biological factor that limits the migration, interbreeding, or free movement of individuals or populations.

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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