10. 
    control rod
    [n] - a steel or aluminum rod that can be moved up or down to control the rate of the nuclear reaction
    Found op http://www.webdictionary.co.uk/definition.php?query=control%20rod
    
    
11. 
    control rod
    noun a steel or aluminum rod that can be moved up or down to control the rate of the nuclear reaction
    Found op http://wordnetweb.princeton.edu/perl/webwn?s=control%20rod
    
    
12. 
    control rod
    (from the article `nuclear reactor`) ...of the coolant circuit or by varying the amount of absorber dissolved in the coolant or moderator, by far the most common method involves the use ...
    Found op http://www.britannica.com/eb/a-z/c/136
    
    
13. 
    Control rod
    A control rod is a rod made of chemical elements capable of absorbing many neutrons without fissioning themselves. They are used in nuclear reactors to control the rate of fission of uranium and plutonium. Because these elements have different capture cross sections for neutrons of varying energies...
    Found op http://en.wikipedia.org/wiki/Control_rod
    
    
14. 
    control rod
    movable element in a nuclear reactor which modifies the reactivity and which is actuated (insertion or withdrawal) for the reactor operation
    Found op http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=393-15-73
    
    
15. 
    control rod
    control member in the form of a rod
    Found op http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=394-35-20
    
    
16. 
    control rod
    Part of the control system of a nuclear reactor which directly affects the rate of the reaction takeing place in the reactor. A control rod is usually a rod or tube made of steel or aluminum containing boron, cadmium, or some other strong absorber of neutrons. It can be moved up or down on its axis....
    Found op http://www.daviddarling.info/encyclopedia/C/control_rod.html
    
    

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