chalasia
noun
cha·la·sia
kə-ˈlā-zhə, ka- 
: the relaxation of a ring of muscle (as the cardiac sphincter of the esophagus) surrounding a bodily opening
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“Chalasia.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/chalasia. Accessed 23 Apr. 2024.
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