Medical Dictionary

achalasia

noun acha·la·sia \ˌā-kə-ˈlā-zh(ē-)ə\

Medical Definition of ACHALASIA

:  failure of a ring of muscle (as a sphincter) to relax <achalasia of the esophagus> <achalasia of the anal sphincter>—compare cardiospasm
April 20, 2015
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