Two decades ago Paul Dickson set out to create a dictionary of baseball terminology. No small task, but Dickson is an expert lexicographer, with a superb ear and a relentless thirst for knowledge. "The Dickson Baseball Dictionary" defined some 5,000 entries. Ten years later, he revised the book, and the total soared to over 7,000 entries. Now in its new, third edition, the definitive "Dickson…