achalasia
noun
acha·la·sia ˌā-kə-ˈlā-zh(ē-)ə 
: failure of a ring of muscle (such as the anal sphincter or one of the esophagus) to relax
Example Sentences
Recent Examples on the Web After Lorraine passed away in May 2018 at age 73, after close to a decade with achalasia, a condition that closes off the esophagus, Chuck set to work living out her wishes. 
Heidi Stevens, chicagotribune.com, 9 Aug. 2019
Heidi Stevens, chicagotribune.com, 9 Aug. 2019 Word History
Etymology
a- entry 2 + Greek chálasis "loosening, relaxation" (from chaláō, chalân "to loosen" —of obscure origin— + -sis -sis) + -ia entry 1
First Known Use
1914, in the meaning defined above
Medical Definition
achalasia
noun
acha·la·sia ˌā-kə-ˈlā-zh(ē-)ə
: failure of a ring of muscle (as a sphincter) to relax
achalasia of the esophagus
achalasia of the anal sphincter
compare cardiospasm