[n] - thick membrane around the mammalian ovum
Found op http://www.webdictionary.co.uk/definition.php?query=zona%20pellucida
Zona pellucida: The strong membrane that forms around an ovum as it develops in the ovary. The membrane remains in place during the egg's travels through the Fallopian tube. To fertilize the egg, a sperm must penetrate the thinning zona pellucida. If fertilization takes place, the membrane disappear...
Found op http://www.medterms.com/script/main/art.html?articlekey=11822
A translucent non-cellular layer surrounding the ovum of many mammals.
Found op http://www.encyclo.co.uk/visitor-contributions.php
<cell biology, gynaecology> A translucent, elastic, noncellular layer surrounding the ovum of many mammals. ... (11 May 1997) ...
Found op http://www.mondofacto.com/facts/dictionary?zona+pellucida
noun thick membrane around the mammalian ovum; can be penetrated by one sperm in the fertilization process; usually remains around the fertilized egg until it is implanted in the wall of the uterus
Found op http://wordnetweb.princeton.edu/perl/webwn?s=zona%20pellucida
(zo´nә pә-loo´sĭ-dә) the transparent, noncellular, secreted layer surrounding an oocyte.
Found op http://www.encyclo.co.uk/local/21001
The zona pellucida (plural zonae pellucidae, also egg coat) is a glycoprotein membrane surrounding the plasma membrane of an oocyte. It is a vital constitutive part of the oocyte, external but of essential importance to it. The zona pellucida first appears in multilaminar primary oocytes. It is sec...
Found op http://en.wikipedia.org/wiki/Zona_pellucida
A gel like layer that surrounds the developing ovum in the ovarian follicle. The zona pellucida plays a key factor in fertilization as it is penetrated by the sperm. Although it will dissapear just prior to implantation, the zona pellucida remains while the zygote undergoes cell divisions through th...
Found op http://www.pregnology.com/AZ/Z/1
The zona pellucida is a transparent, striated membrane surrounding the ovum and containing the cytoplasm, which gives the cell its body. The zona pellucida contains numerous pores through which nutrition is passed to the cell. Once the zona pellucida has been penetrated by a sperm the ovum becomes r...
Found op http://www.probertencyclopaedia.com/browse/EZ.HTM
Thick, transparent outer envelope or casing that surrounds an ovum (egg).
Found op http://www.thehorse.com/Glossary.xhtml?L=Z
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