do you know what that diconary site is called

Do you mean Wikipedia? Try that one, I like using it.

thanks but are teachers say we can't because just any one can post stuff on it i guess..

Here are two dictionary sites:

http://dictionary.reference.com/

http://www.websters-online-dictionary.org/

Yes, the dictionary site that is commonly used is called "Merriam-Webster." It is a popular online dictionary that provides definitions, pronunciations, usage examples, and other information about words in the English language.

If you are looking for the meaning or definition of a specific word, you can visit the Merriam-Webster website by following these steps:

1. Open your web browser (such as Google Chrome, Mozilla Firefox, or Safari).
2. In the address bar at the top of the browser window, type "www.merriam-webster.com" and press Enter.
3. Once the website loads, you will see a search bar in the center of the page.
4. Type the word you want to look up in the search bar and click the "Search" button or press Enter.
5. The dictionary entry for the word you searched will be displayed, including its definition, pronunciation, and other relevant information.

You can explore the website further to learn about word origins, synonyms, examples of word usage, and more.