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zone of saturation
zone out
zone rebate
zone refining
zonetime
zonk
zonked
zonule
zoo
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zoo TV
zooflagellate
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zona pellucida
zo·na pel·lu·ci·da [ znə pə lssidə ]


noun 
Definition:
 
layer enclosing egg cell: a thick transparent envelope that surrounds a developing ovum, allowing only one sperm cell through to fertilize the ovum
[< modern Latin, "transparent band"]
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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