[ak-uh-ley-zhuh, -zhee-uh, -zee-uh]
noun Medicine/Medical.
inability of a circular muscle, especially of the esophagus or rectum, to relax, resulting in widening of the structure above the muscular constriction.

1910–15; a-6 + Greek chálas(is) (chala- (stem of chalân to loosen) + -sis -sis) + -ia Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
achalasia (ˌækəˈleɪzɪə)
pathol failure of the cardiac sphincter of the oesophagus to relax, resulting in difficulty in swallowing
[New Latin, from a-1 + Greek chalasis relaxation]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
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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