Useful dictionaries

• OneLook Dictionary Search
  http://onelook.com/
  
  
• Merriam-Webster Online Dictionary
  http://www.m-w.com/dictionary/
  
  
• The American Heritage® Dictionary of the English Language: Fourth Edition.  2000
  via http://onelook.com/
  
  
• Technical and Popular Medical Terms
  http://users.ugent.be/~rvdstich/eugloss/EN/lijst.html