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oysterman
oysters rockefeller
Oz
oz (1)
oz (2)
ozocerite
ozone
ozone-friendly
ozone hole
ozone layer
ozoner
ozonide
ozonize
ozonizer
ozonolysis
ozonosphere
P (1)
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ozone hole
ozone hole (plural ozone 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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