We were playing Balderdash the other day and the word ganoisis came up. I have to admit that I did not believe it was a real word. I'm still not sure that I do. Here's the definition:
ganosis n. - reducing shine of marble, especially on naked parts of statue.
It's not in any of my dictionaries, and Dictionary.com doesn't have an entry for it. Merriam Webster acts like they have one, but it's in the pay section, so I can't confirm that they do. All the entries I've seen for it look exactly like the Balderdash card. I'd like to see some etymology and find it someplace besides Luciferous Logolepsy before I'm convinced that it is a word.
I suppose that is one of the nice things about just playing this game with a dictionary. At least you know the word really is an actual word and can prove it to disbelieving participants!