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potato blight
potato bug
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potential barrier
po·ten·tial bar·ri·er (plural po·ten·tial bar·ri·ers)


noun 
Definition:
 
region in force field opposing particle: a region in a field of force where a particle experiencing the force encounters opposition to its motion
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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