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oxytocic
oxytocin
oxytone
oxyuriasis
oyer and terminer
oyez
oyster
oyster bed
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ozone hole
o·zone hole (plural o·zone holes)


noun 
Definition:
 
hole in ozone layer: an area of the upper atmosphere where the ozone layer is absent or has become unusually thin
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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