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Poisson’s ratio
Poitiers
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polar axis
po·lar ax·is (plural po·lar ax·es)


noun 
Definition:
 
fixed reference line: the fixed horizontal line in a system of polar coordinates from which the angle made by the radius vector is measured
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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