Definition of anus noun from the Oxford Advanced Learner's Dictionary

 

anus

 noun
noun
BrE BrE//ˈeɪnəs//
 
; NAmE NAmE//ˈeɪnəs//
 
(anatomy) Internal anatomy, Body parts
 
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the opening in a person’s bottom through which solid waste leaves the body see also anal See related entries: Internal anatomy, Body parts Word Origin late Middle English: from Latin, originally ‘a ring’.
See the Oxford Advanced American Dictionary entry: anus