[″ + L. astrum, star, ill-starred]
A natural or man-made occurrence such as a flood, tornado, earthquake, forest fire, bridge or building collapse, nuclear reactor accident, war, explosion, terrorist attack or bombing, or train wreck. The need for emergency evacuation and medical services is increased during and following a disaster. It is essential that hospitals and community services have a plan for the expeditious mobilization and use of their services at such times.