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

 

smegma

 noun
noun
BrE BrE//ˈsmeɡmə//
 
; NAmE NAmE//ˈsmeɡmə//
 
[uncountable](medical)
 
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a substance produced in the folds of the skin, especially under the foreskin Word Origin early 19th cent.: via Latin from Greek smēgma ‘soap’, from smēkhein ‘cleanse’.
See the Oxford Advanced American Dictionary entry: smegma