Look up: Zona Pellucida

1. 
   zona pellucida
   [n] - thick membrane around the mammalian ovum
   Found on http://www.webdictionary.co.uk/definitio
   
   
2. 
   Zona pellucida
   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 disappears to permit implantation in the uterus.
   Found on http://www.medterms.com/script/main/art.
   
   
3. 
   zona pellucida
   A translucent non-cellular layer surrounding the ovum of many mammals.
   Found on
   
   
4. 
   zona pellucida
   <cell biology, gynaecology> A translucent, elastic, noncellular layer surrounding the ovum of many mammals. ... (11 May 1997) ...
   Found on http://www.mondofacto.com/facts/dictiona
   
   
5. 
   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 on http://wordnet.princeton.edu/perl/webwn?
   
   
6. 
   Zona pellucida
   The `zona pellucida` (or `zona striata` in older texts) is a glycoprotein membrane surrounding the plasma membrane of an oocyte. It is a vital constitutive part of the latter, external but not extraneous to it. This structure binds spermatozoa, and is required to initiate the acrosome reaction. The zona glycoprotein, ZP3, is responsible for sperm binding, adhering to proteins on the sperm plasma membrane. There is evidence that ZP3 is then in...
   Found on http://en.wikipedia.org/wiki/Zona_pelluc
   
   
7. 
   zona pellucida
   (zo´nә pә-loo´sĭ-dә) the transparent, noncellular, secreted layer surrounding an oocyte.
   Found on http://www.mercksource.com/pp/us/cns/cns
   
   
8. 
   zona pellucida
   an extracellular coat, rich in glycoprotein, surrounding the oocyte; it contains microvilli of the oocyte and cellular processes of follicular cells and appears homogeneous and translucent under the light microscope. Syn: pellucid zone
   Found on
   
   
9. 
   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 the blastocyst stage.
   Found on http://www.pregnology.com/AZ/Z/1