Look up: Polyspermy

1. 
   polyspermy
   Penetration of more than one spermatozoon into an ovum at time of fertilization. Occurs as normal event in very yolky eggs (eg. bird), but then only one sperm fuses with egg nucleus. Many other eggs have mechanisms to block polyspermy.
   Found on
   
   
2. 
   Polyspermy
   Pol'y·sper`my noun (Biol.) Fullness of sperm, or seed; the passage of more than one spermatozoön into the vitellus in the impregnation of the ovum.
   Found on http://www.encyclo.co.uk/webster/P/124
   
   
3. 
   polyspermy
   Penetration of more than one spermatozoon into an ovum at time of fertilization. Occurs as normal event in very yolky eggs (e.g. Bird), but then only one sperm fuses with egg nucleus. Many other eggs have mechanisms to block polyspermy. ... (18 Nov 1997) ...
   Found on http://www.mondofacto.com/facts/dictiona
   
   
4. 
   Polyspermy
   In biology, `polyspermy` describes an egg that has been fertilized by more than one sperm. Diploid organisms normally contain two copies of each chromosome, one from each parent. The cell resulting from polyspermy, on the other hand, contains three or more copies of each chromosome -- one from the egg and one each from multiple sperm. Usually, the result is an inviable zygote. This may occur because sperm have become too efficient at reaching and...
   Found on http://en.wikipedia.org/wiki/Polyspermy
   
   
5. 
   polyspermy
   (pol″e-spur´me) fertilization of an oocyte by more than one spermatozoon; occurring normally in certain species (physiologic polyspermy) but only abnormally in species such as humans (pathologic polyspermy).
   Found on http://www.mercksource.com/pp/us/cns/cns
   
   
6. 
   Polyspermy
   • (n.) Fullness of sperm, or seed; the passage of more than one spermatozoon into the vitellus in the impregnation of the ovum.
   Found on http://thinkexist.com/dictionary/meaning
   
   
7. 
   polyspermy
   (from the article `fertilization`) ...causes a change in the egg membrane(s), so that the attachment of and penetration by more than one spermatozoon cannot occur. In species in which ...
   Found on http://www.britannica.com/eb/a-z/p/91
   
   
8. 
   polyspermy
   polyspermy Related topics utilizing this poly- prefix: Polysemy and Polysemous and Polygamy Sections.
   Found on http://www.wordinfo.info/words/index/inf
   
   
9. 
   polyspermy
   polyspermy, polyspermic The penetration of multiple sperms (spermatozoa) into a single ovum at the time of fertilization.
   Found on http://www.wordinfo.info/words/index/inf
   
   
10. 
    polyspermy
    The entrance of more than one spermatozoon into the ovum. Syn: polyspermism, polyspermia 1
    Found on
    
    
11. 
    Polyspermy
    An unusual occurrence in which one egg is fertilized by more than one sperm.
    Found on http://www.pregnology.com/AZ/P/7