1. 
   XYY
   [n] - (genetics) abnormal complement of sex hormones in a male who has two Y chromosomes
   Found op http://www.webdictionary.co.uk/definition.php?query=XYY
   
   
2. 
   XYY
   XYY: An extra Y chromosome in a male. See: XYY syndrome.
   Found op http://www.medterms.com/script/main/art.html?articlekey=38803
   
   
3. 
   XYY
   noun (genetics) abnormal complement of sex hormones in a male who has two Y chromosomes
   Found op http://wordnetweb.princeton.edu/perl/webwn?s=XYY
   
   
4. 
   xyy
   1) Sex chromosome 2) Xyy
   Found op http://www.mijnwoordenboek.nl/EN/crossword-dictionary/xyy/1
   
   

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