noun, plural perinea [per-uh-nee-uh] . Anatomy.
the area in front of the anus extending to the fourchette of the vulva in the female and to the scrotum in the male.
the diamond-shaped area corresponding to the outlet of the pelvis, containing the anus and vulva or the roots of the penis.

1625–35; < Neo-Latin < Greek períneon, períneos, perínaios, apparently equivalent to per(i)- peri- + ine-, ina-, stems of ineîn, inân to evacuate, empty + -(i)os, -(i)on noun suffix

perineal, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
perineum (ˌpɛrɪˈniːəm)
n , pl -nea
1.  the region of the body between the anus and the genital organs, including some of the underlying structures
2.  the nearly diamond-shaped surface of the human trunk between the thighs
[C17: from New Latin, from Greek perinaion, from peri- + inein to empty out]

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Word Origin & History

"region of the body between the anus and the genital organs," 1632, from M.L. perinaeon, L.L. perineum (c.440), from Gk. perinaion, perinaios, from peri- "near" + inan "to carry off by evacuation," of unknown origin.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

perineum per·i·ne·um (pěr'ə-nē'əm)
n. pl. per·i·ne·a (-nē'ə)

  1. The portion of the body in the pelvis occupied by urogenital passages and the rectum, bounded in front by the pubic arch, in the back by the coccyx, and laterally by part of the hipbone.

  2. The region between the scrotum and the anus in males, and between the posterior vulva junction and the anus in females.

per'i·ne'al (-nē'əl) adj.
The American Heritage® Stedman's Medical Dictionary
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American Heritage
Science Dictionary
perineum   (pěr'ə-nē'əm)  Pronunciation Key 
Plural perinea
The region between the scrotum and the anus in males, and between the posterior vulva and the anus in females.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Actions-The simultaneous contraction of the two muscles serves to fix the central tendinous point of the perineum.
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