Goodgold gets the credit for this one, but says he's too
lazy to post it himself. For an incredibly easy-read
definition, go to gurunet.com and get the free download.
Then, all you have to do is hold Alt, click on a word you
want to look up, and a small window will appear with the
definition, without you having to shrink your original
window! I have tried a few it hasn't recognized, but it
is has come in very handy!

Thank you for this lead.
I loaded it 5 minutes ago, and already I'm impressed.