help with ordering shoes on line what does C/D mean?

http://www.amazon.com/New-Balance-Womens-Wx623-Training/dp/B002TX6K5K/ref=sr_1_7?ie=UTF8&qid=1339691816&sr=8-7&keywords=new+balance+women

Penelope2012-06-14T09:54:23Z

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Width. B is considered normal, C and D are wides.