Go to MSN Homeencarta®
Dictionary
Find
in
Dictionary
Thesaurus
Translations
ABCDEFGHIJKLMNOPQRSTUVWXYZ
Click to move up the list of words
zookeeper
zool.
zoolatry
zoological
zoological garden
zoology
zoom
zoom in
zoom lens
zoom out
zoomastigote
zoombag
zoometry
zoomorphism
-zoon
zoonosis
zoophagous
Click to move down the list of words
Also available:

World English Dictionary
Dictionnaire Français

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.
Advertisement
© 2009 Microsoft