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perigynous
perihelion
perikaryon
peril
peril point
perilla
perilous
perilune
perilymph
perimeter
perimorph
perimysium
perinatal
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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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