1. 
   XX
   [n] - (genetics) normal complement of sex chromosomes in a female
   Found op http://www.webdictionary.co.uk/definition.php?query=XX
   
   
2. 
   XX
   The pair of sex chromosomes found in human females
   Found op http://www.makingsenseofhealth.org.uk/default.html?section=Secondary&chapte
   
   
3. 
   XX
   XX: The sex chromosome complement of a normal human female. See also X chromosome.
   Found op http://www.medterms.com/script/main/art.html?articlekey=11839
   
   
4. 
   XX
   noun (genetics) normal complement of sex chromosomes in a female
   Found op http://wordnetweb.princeton.edu/perl/webwn?s=XX
   
   
5. 
   XX
   [album] XX (pronounced Double X) is the fourth album and major label debut by industrial metal band Mushroomhead, released in 2001. Originally released through Eclipse Records, where Mushroomhead took classic tracks and re-recorded them. XX was entirely re-recorded and re-released on Univers...
   Found op http://en.wikipedia.org/wiki/XX_(album)
   
   
6. 
   Xx
   [album] xx is the debut studio album by English indie pop group The xx, released on 17 August 2009 by Young Turks. The self-produced album was recorded at XL Studios in West London between December 2008 and April 2009. Upon its release, xx received general acclaim from music critics, and it ...
   Found op http://en.wikipedia.org/wiki/Xx_(album)
   
   
7. 
   xx
   1) 20 2) Cardinal 3) Twenty
   Found op http://www.mijnwoordenboek.nl/EN/crossword-dictionary/xx/1
   
   

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