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orology
OROM
Oromo
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oropendola
oropharynx
orotund
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orthogonal
or·thog·o·nal [ awr thóggən'l ]


adjective 
Definition:
 
1. relating to right angles: relating to or composed of right angles
2. describing crystal structure: describes a set of axes all at right angles to each other in a crystal structure

or·thog·o·nal·ly [ awr thóggənəlee ] adverb
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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