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period certain
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periodic
periodic acid
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peripheral

pe·riph·er·al [ pə ríffərəl ]


adjective 
Definition:
 
1. at edge: at or relating to the edge of something, as opposed to its center

2. not significant: minor or incidental in importance or relevance

3. anatomy near surface: near the surface of an organ or the body



noun  (plural pe·riph·er·als)
Definition:
 
comput peripheral piece of hardware: a piece of computer hardware such as a printer or a disk drive that is external to but controlled by a computer's central processing unit


pe·riph·er·al·ly adverb
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