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perineum
perineurium
period
period certain
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periodic
periodic acid
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periodic law
pe·ri·od·ic law


noun 
Definition:
 
law of chemical similarity: the law stating that chemical elements fall into groups sharing similar properties when they are arranged according to atomic number
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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