inability of a circular muscle, especially of the esophagus or r-ct-m, to relax, resulting in widening of the structure above the muscular constriction.
(pathol) failure of the cardiac sphincter of the oesophagus to relax, resulting in difficulty in swallowing

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

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