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periodontal
periodontics
perionychium
periosteum
periostitis
periostracum
periotic
Peripatetic
peripatetic
peripatus
peripheral
peripheral nerve entrapment syndrome
peripheral nervous system
periphery
periphery region
periphrasis
periphrastic
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periodic motion
pe·ri·od·ic mo·tion (plural pe·ri·od·ic mo·tions)


noun 
Definition:
 
motion repeated regularly: motion that is repeated at regular intervals
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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