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anaemia
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anaerobic process
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anal sphincter
a·nal sphinc·ter (plural a·nal sphinc·ters)


noun 
Definition:
 
muscle ring at the anus: the double muscular ring surrounding the anal canal that relaxes during defecation
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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