achalasia

achalasia definition - medical

ach·a·la·sia (ăkˌə-lāˈzhə)

noun
The failure of a ring of muscle fibers, such as a sphincter, to relax.

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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