1. 
   carbon 12
   (12C) Type: Term Pronunciation: kar′bŏn Definitions: 1. The standard of atomic mass, 98.90% of natural carbon.
   Found op http://www.medilexicon.com/medicaldictionary.php?t=14239
   
   
2. 
   carbon-12
   The standard of atomic mass, 98.90% of natural carbon. ... (05 Mar 2000) ...
   Found op http://www.mondofacto.com/facts/dictionary?carbon-12
   
   
3. 
   carbon-12
   (from the article `carbon`) ...in nature, carbon is not particularly plentiful (it makes up only about 0.025 percent of the Earth`s crust); yet it forms more compounds than all ...
   Found op http://www.britannica.com/eb/a-z/c/22
   
   

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