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Worm (or Dionin, name given by fans) is one of the unused colossi that did not make it into the final release of the game.
According to an old Team Ico Gamers Blog post, the colossus was removed for being too powerful and because it required a huge arena to be able to dodge its attacks.
Unlike the names given by fans to Spider and Phoenix, Dionin is not a Welsh word. The nickname is possibly a tribute to the snake god Dionin from the film The Lair of the White Worm.