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operatise
operative
operatize
operator
operator gene
operculum
operetta
operon
operose
Ophelia
ophicleide
ophidian
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operose
op·er·ose [ óppə rss ]


adjective 
Definition:
 
1. taxing: requiring a lot of effort
2. busy: busy, active, or hard working
[Late 17th century. < Latin operosus< oper-, stem of opus (see opus)]

op·er·ose·ly adverb
op·er·ose·ness noun
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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