Webster's English Dictionary

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perineum

per.i.ne.um \-'ne--*m\ \-'ne--*\ n or per.i.nea [NL, fr. LL perinaion, fr. 
   Gk, fr. peri- + inein to empty out] pl ; akin to L ira ire : an area of 
   tissue marking externally the approximate boundary of the out let of the 
   pelvis and giving passage to the urinogenital ducts and rectum; also : the 
   area between the anus and the posterior part of the external genitalia esp. 
   in the female