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motion sickness
mo·tion sick·ness


noun 
Definition:
 
North America sick feeling caused by movement: a feeling of nausea resulting from overstimulation of the part of the ear that controls balance, caused especially by travel in a moving vehicle

mo·tion sick adjective
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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