A "dragon" is also a term from the game of Go (Wei Qi/Badouk). It refers to a long chain of connected stones with no eyes. One is shown in the diagram below:

........
....oo..
.....oo.
......o.
...oooo.
..oo....
........

Of course, a dragon won't occur all alone on the goban (board). Rather, it will occur in the presence of other stones, especially the opponent's. Although the dragon has no eyes and isn't technically "alive," there is a Go proverb that says that "Big dragons never die." That's because a dragon tends to have a lot of liberty, so it's hard to get it completely surrounded. In other words, if you think you've killed a big dragon (and probably won the game because of it), always read the situation out very carefully to be sure that you've killed it, because they have sneaky ways of escaping.