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 re...
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http://en.wikipedia.org/wiki/Polyspermy
• (n.) Fullness of sperm, or seed; the passage of more than one spermatozoon into the vitellus in the impregnation of the ovum.
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http://thinkexist.com/dictionary/meaning/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 ...
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http://www.britannica.com/eb/a-z/p/91
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) ...
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http://www.encyclo.co.uk/local/20973
(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).
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http://www.encyclo.co.uk/local/21001
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.
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http://www.encyclo.co.uk/visitor-contributions.php
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.
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http://www.encyclo.co.uk/webster/P/124
Type: Term Pronunciation: pol′ē-sper′mē Definitions: 1. The entrance of more than one sperm into the oocyte. Synonyms: polyspermia1, polyspermism
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http://www.medilexicon.com/medicaldictionary.php?t=71109
An unusual occurrence in which one egg is fertilized by more than one sperm.
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http://www.pregnology.com/
polyspermy Related topics utilizing this poly- prefix: Polysemy and Polysemous and Polygamy Sections.
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http://www.wordinfo.info/words/index/info/view_unit/2804/14
polyspermy, polyspermic The penetration of multiple sperms (spermatozoa) into a single ovum at the time of fertilization.
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http://www.wordinfo.info/words/index/info/view_unit/2804/15
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