VS 2010 : Return Data From A Specific <div> Via A Web Request?

I am trying to search for a term on this site: [URL] and return the definition of the term to a RichTextBox. I can search for the term easily enough. My initial idea was to find a div class similar to every definition, and in the source returned from my WebRequest there is always the div class:

<div class="luna-Ent">

So for example, if you search the term "lol" and view the page source, the definition for that term is wrapped as follows:

<div class="luna-Ent">laughing out loud; laugh out loud: used as a response to something funny or as a follow-up to something said only as a joke.</div>

My problem is that I cannot split the string, which contains the entire text from this web response, leaving just the above. Which I would further split to leave just the definition.Every time I attempt to split the string I get a bogus result with randomly cut up words and nonsense. There is only one <div class="luna-Ent">, so I have no idea why this isn't working when it does with a simpler string such as "lol?55?44" which you would split using "?".Here is the code so far, please excuse the crappy variable names. I always structure my stuff like that when testing?

Private Sub TextBox1_TextChanged(ByVal sender As System.Object, ByVal e As System.Windows.Forms.KeyEventArgs) Handles TextBox1.KeyDown
If e.KeyCode = Keys.Enter Then
e.SuppressKeyPress = True

[code]....

Instead of my method, is there any way to return only the data, from the web request, wrapped in that div class?