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nidificate
nidifugous
nidify
nidus
niece
niello
nielsbohrium
nieve
nieve penitente
NIF
nifedipine
niff
nifty
Nig.
nigella
Niger
Niger-Congo
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nicotinic acid
nic·o·tin·ic ac·id


noun 
Definition:
 
biochemistry 
Same as  niacin
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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