achalasia

 
Pronunciation: /ˌakəˈleɪzɪə/

noun

[mass noun] Medicine
  • a condition in which the muscles of the lower part of the oesophagus fail to relax, preventing food from passing into the stomach.

Origin:

early 20th century: from a-1 'without, not' + Greek khalasis 'loosening' (from khalan 'relax') + -ia1