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periodic law
periodic motion
periodic sentence
periodic system
periodic table
periodical
periodical cicada
periodicity
periodization
periodontal
periodontics
perionychium
periosteum
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perineum

per·i·ne·um [ pèrrə n əm ] (plural per·i·ne·a [ pèrrə n ə ])


noun 
Definition:
 
body part at bottom of pelvis: the region of the abdomen surrounding the urogenital and anal openings

[Mid-17th century. Via late Latin< Greek perinaion< peri "around" + inan "excrete"]

per·i·ne·al adjective
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