What does postdoctoral mean?

Question: What does postdoctoral mean?
- Keywords:
  career,
  education,
  scientist
Asked by kathryn to Lena on 19 Mar 2012.
- Lena Ciric answered on 19 Mar 2012:
  
  Hi Kathryn. It means that I have a doctorate or PhD. You work on this for 3-4 years after you get your first degree and and the end of it you can call yourself Dr! 🙂

tomalie commented on 19 Mar 2012:

So people call you Dr. Ciric?

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- Lena commented on 19 Mar 2012:
  
  Yes! It was funny at first but I’m used to it now.
  
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  - macklev2 commented on 20 Mar 2012:
    
    why did they??
    
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    - Lena commented on 20 Mar 2012:
      
      Because I’m a doctor of bacteria! It’s true – I have the certificate to prove it.
      
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Question: What does postdoctoral mean?