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periodical
periodical cicada
periodicity
periodization
periodontal
periodontics
perionychium
periosteum
periostitis
periostracum
periotic
Peripatetic
peripatetic
peripatus
peripheral
peripheral nerve entrapment syndrome
peripheral nervous system
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periproct
per·i·proct [ pérrə pròkt ] (plural per·i·procts)


noun 
Definition:
 
area near anus of invertebrate: the area surrounding the anus of some invertebrate animals such as sea urchins
[Late 19th century. <peri- + Greek prōktos "anus"]
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