:post-traumatic stress disorder occurring under wartime conditions (as combat) that cause intense stress :battle fatigue, combat fatigue
- In the receiving ward he found a patient shivering on his bunk with a diagnosis—in this case accurate—of severe shell shock.
- —Albert E. Cowdrey
- A Veterans Administration psychiatrist, Dr. Jack Ewald, has reckoned that some 700,000 Vietnam veterans have suffered from various forms of "post-traumatic stress syndrome," the modern term for what was called "shell shock" in World War I and "battle fatigue" in World War II.
- —Stanley Karnow