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quartz clock
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quaternary ammonium compound
qua·ter·nar·y am·mo·ni·um com·pound (plural qua·ter·nar·y am·mo·ni·um com·pounds)


noun 
Definition:
 
nitrogen compound: a nitrogen compound regarded as a derivative of ammonium. Use: solvents, disinfectants.
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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