TheMadScientist - 7:59 pm on May 21, 2011 (gmt 0)

A snippet is a text excerpt that appears below a page's title in our search results and describes the content of the page. ... You can, however, specify that Google should not show a snippet (in which case neither the text snippet nor the preview icon will appear).

Not according to the the Webmaster Tools Help resource linked in the OP of this thread.