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crassulacean acid metabolism
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crash helmet
crash hel·met (plural crash hel·mets)


noun 
Definition:
 
safety helmet: a hard padded helmet worn by cyclists, racing drivers, and others to protect the head in case of an accident
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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