Medical Dictionary

achalasia ach·a·la·sia (āk'ə-lā'zhə)
The failure of a ring of muscle fibers, such as a sphincter, to relax.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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