10. 
    perforation
    (pur″fә-ra´shәn) the act of boring or piercing through a part. a hole or break in the containing walls or membranes of an organ or structure of the body, occurring when erosion, infection, or other factors create a weak spot in the organ and internal pressure causes a rupture. It ...
    Found op http://www.encyclo.co.uk/local/21001
    
    
11. 
    Perforation
    • (n.) A hole made by boring or piercing; an aperture. • (n.) The act of perforating, or of boring or piercing through.
    Found op http://thinkexist.com/dictionary/meaning/perforation/
    
    
12. 
    perforation
    (L. perforare to pierce through) 1. the act of boring or piercing through a part. 2. a hole made through a part or substance.
    Found op http://users.ugent.be/~rvdstich/eugloss/DIC/dictio65.html
    
    
13. 
    perforation
    perforation 1. The act of boring or piercing through a part. 2. A hole made through a part or substance. 3. The act of punching a hole; especially, a row of holes as for ease of separation. 4. A line of small holes for tearing at a particular place.
    Found op http://www.wordinfo.info/words/index/info/view_unit/844/
    
    
14. 
    Perforation
    A perforation is a small hole in a thin material or web. There is usually more than one perforation in an organized fashion, where all of the holes are called a perforation. The process of creating perforations is called perforating, which involves puncturing the workpiece with a tool. Perforations...
    Found op http://en.wikipedia.org/wiki/Perforation
    
    
15. 
    Perforation
    Another term for core.
    Found op http://www.aeroconsystems.com/glossary.htm
    
    
16. 
    Perforation
    A hole trhat form in tissue and organs because of disease or injury
    Found op http://www.pregnology.com/AZ/P/3
    
    
17. 
    perforation
    Type: Term Pronunciation: per′fō-rā′shŭn Definitions: 1. Abnormal opening in a hollow organ or viscus. Synonyms: tresis
    Found op http://www.medilexicon.com/medicaldictionary.php?t=66866
    
    
18. 
    Perforation
    Perforations or brogueing refers to the holes in shoes that make an ordinary shoe look more elaborate. Originally thought to have started in Scotland where the holes allowed water to drain out of the shoes, but nowadays is used just as a decoration and to highlight.
    Found op http://www.baselondon.com/shoe_glossary.xhtml
    
    
19. 
    perforation
    1) Hole
    Found op http://www.mijnwoordenboek.nl/EN/crossword-dictionary/perforation/1
    
    

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