phimosis

noun
phi·mo·sis | \fī-ˈmō-səs, fi- \
plural phimoses\-ˌsēz \

Medical Definition of phimosis 

: tightness or constriction of the orifice of the foreskin arising either congenitally or postnatally (as from balanoposthitis) and preventing retraction of the foreskin over the glans

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