Medical Dictionary


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


How to use a word that (literally) drives some people nuts.
Test your vocab with our fun, fast game
Ailurophobia, and 9 other unusual fears