Exclude all hidden directories in UNIX find

I'm doing a word search using the following command:

find . -exec grep -q [some_word]  '{}' \; -print -o -name .svn -prune -o -name .ssh -prune -o -name .boneyard -o -name log -prune -prune -o -name tmp -prune

Is it possible to use a regex to exclude all hidden directories?

Note: The current command traverses the entire tree from the current location and exclude those being pruned. The exclusion needs to work for any hidden directory regardless off location.