I guess my question is this. Since the writer of Revelation is the only Bible writer who used the word dragon, what was he referring to? Assuming he was referring to a mythological creature even then, and he probably got the concept from some other writing of the time period, what was it? I think the stereo typical dragon we think of, breathing fire, etc, probably came out of the Middle Ages. So if the writer of Revelation actually drew a picture of his 'dragon', what would it be?
I'm too lazy to go do the research myself, but I never thought of this topic until now.