"I know it when I see it" was the famous response by a U.S. Supreme Court justice to the vexed problem of defining pornography. Terrorism may be no less difficult to define, but the wanton killing of schoolchildren, of mourners at a funeral, or workers at their desks in skyscrapers surely fits the know-it-when-I-see-it definition.The press, however, generally shies away from the word terrorist, preferring euphemisms. Take the assault that led to the deaths of some 400 people, many of them children, in Beslan, Russia, on September 3. Journalists have delved deep into their thesauruses, finding at least twenty euphemisms...