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orthopedics
orthophosphate
orthophosphoric acid
orthopsychiatry
orthopteran
orthopterous
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os (1)
os [ oss ] (plural o·ra [ áwrə ])


noun 
Definition:
 
mouth: a mouth or similar opening in an organism
[Mid-18th century. < Latin, "mouth, face, head" (stem or-)]
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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