Forum Moderators: open
We have a very competitive site and for the main search term, Google is NOW showing the meta desciption instead of the snippet which it did before.
The keyword is there in the snippet, but Google is choosing "meta desiption" instead.
Personally I think a number of factors come into play for this scenario to take place, and they "include" your Dmoz desciption.
Shak
It seems a fact also, that the meta description is not indexed by Google and therefore not searchable (if the keyword is only in the description).