[Zuko decides to keep quiet about the fact that dragons are prone to being grumpy, too. He'll never hear the end of it.]
It means 'thunder dragon'. [And because Aang being Aang, he's bound to ask:] Consider it more of a poetic name than literal -- he can't generate lightning.
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It means 'thunder dragon'. [And because Aang being Aang, he's bound to ask:] Consider it more of a poetic name than literal -- he can't generate lightning.