1. 
   yellow birch
   [n] - tree of eastern North America with thin lustrous yellow or gray bark
   Found op http://www.webdictionary.co.uk/definition.php?query=yellow%20birch
   
   
2. 
   yellow birch
   Betula alleghaniensis noun tree of eastern North America with thin lustrous yellow or grey bark
   Found op http://wordnetweb.princeton.edu/perl/webwn?s=yellow%20birch
   
   
3. 
   yellow birch
   (Betula alleghaniensis, or B. lutea), ornamental and timber tree of the family Betulaceae, native to the northeastern part of North America.
   Found op http://www.britannica.com/eb/a-z/y/6
   
   

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