Saved website on my iPhone 4?

I have a saved autofill website on my iPhone. Whenever I go on safari and only type in the letter c as a webpage, a website conjuguemos.com is saved and is always listed under, a website I used for school. I cleared my history and I know I didn't save it as a bookmark or it would've been listed. I went under settings in my iPhone and went on safari and cleared history, and the cookies and data and no matter what it's still there and I find it fairly annoying considering I won't need it anymore for school at all. (A pet peeve I have) How can I get rid of it?

Press the bookmark button on the bottom of the screen in safari then press History then press clear and it should go away.