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what does DO mean after a doctors name
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In the "Medical English" section, there is a thread that goes on for pages and pages about this.

Here is a link to the Wikipedia article on the DO.
http://en.wikipedia.org/wiki/Doctor_of_Osteopathic_Medicine
Comments  
Probably "Doctor of Osteopathy" (which concentrates on manipulation of the body, massage therapy and the like).
 BarbaraPA's reply was promoted to an answer.