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acetic anhydride
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achalasia
ach·a·la·sia [ àkə láyə, àkə láyee ə ]


noun 
Definition:
 
failure of muscle to relax: a failure of smooth muscle bands such as those in the gullet to relax
[Early 20th century. <a-2 + Greek khalasis "relaxation" < khalan "loosen"]
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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