When someone refers to a trial lawyer, he is (I believe) talking about a personal injury lawyer. What makes a personal injury lawyer a trial lawyer? Aren’t most lawyers trial lawyers?
A trial lawyer is just a lawyer who appears in court, as opposed to a lawyer who only researches and briefs, or drafts contracts, or what have you. Lots of lawyers never see the inside of a courtroom.
Most lawyers’ practices can be described as either litigation or transactional work. A transactional practice involves an area of law like corporate finance or real estate, which primarily involves negotaiting deals and drafting documents, and little or no work inside a courtroom. A litigation practice involves preparing cases for trial, usually but not always reaching a compromise and settlement along the way.
Any lawyer who tries cases, even in a specialized court such as a tax court, can legitimately call himself or herself a “trial lawyer.” (My only quibble with pravnik is that appearing in court is not necessarily trial work: I appeared in court regularly for five years arguing motions before I tried my first case.) But Earl of Sandwhich is correct that the term “trial lawyer” has been successfully co-opted by the plaintiff’s bar. I suspect that the shift occurred in the early 1970s when the National Association of Claimants’ Compensation Attorneys changed its name to the Association of Trial Lawyers of America: