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OSF
Osh
OSHA
Oshawa
Oshkosh
Oshogbo
OSI
osier
Osiris
-osis
Oslo
Osmanli
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osmic
osmic acid
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osmotic pressure
os·mot·ic pres·sure


noun 
Definition:
 
pressure needed to stop osmosis: the pressure that must be applied to a solution to stop osmosis
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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