• inability of a circular muscle, esp. of the esophagus or rectum, to relax, resulting in widening of the structure above the muscular constriction
  • an esophageal disorder resulting in difficulty in swallowing [n ACHALASIAS]
  • (Greek) failure of the muscles of the lower part of the oesophagus to relax, which prevents food from passing into the stomach [n -S]