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natriuretic factor
natrolite
natron
natter
natterjack
natty
natural
natural advantages
natural aging
natural business year
natural childbirth
natural death
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natural fiber
natural food
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natural aging
nat·u·ral ag·ing


noun 
Definition:
 
physical changes in material over time: physical changes that occur within a material over time at normal temperatures
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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