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quarter sessions
quarter step
quarter tone
quarterage
quarterback
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quarterfinal
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quartz crystal
quartz crys·tal (plural quartz crys·tals)


noun 
Definition:
 
quartz piece vibrating at known frequency: a small piece of quartz cut so that it vibrates at a known frequency
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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