An unexpected natural or man-made catastrophe of substantial extent causing significant physical damage or destruction, loss of life or sometimes permanent change to the natural environment.
An unforeseen event causing great loss, upset or unpleasantness of whatever kind.
A complex, multifarious problem or situation that cannot be solved easily and rapidly.
Any of several small freshwater polyps of the genus Hydra and related genera, having a naked cylindrical body and an oral opening surrounded by tentacles.
A dragon-like creature with many heads and the ability to regrow them when maimed.