achalasia

noun4

1. •
   A neuromuscular condition where a ring of muscles is unable to relax fully, causing obstruction of a lumen.
2. •
   Such obstruction in the esophagus: esophageal achalasia.
3. •
   Such esophageal achalasia of primary (idiopathic) nature: primary esophageal achalasia.
4. •
   Such obstruction due to impairment of other gastrointestinal tract smooth muscles.