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operate
operatic
operatics
operating cash flow
operating costs
operating cycle
operating exposure
operating income
operating lease
operating leverage
operating microscope
operating risk
operating room
operating system
operating table
operating theatre
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opera hat
op·er·a hat (plural op·er·a hats)


noun 
Definition:
 
collapsible top hat: a man's collapsible top hat that is spring-operated
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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