Postman \Post"man\, n.; pl. Postmen.

1. A post or courier; a letter carrier.

2. (Eng. Law) One of the two most experienced barristers in the Court of Exchequer, who have precedence in motions; -- so called from the place where he sits. The other of the two is called the tubman. --Whishaw.

Source: Webster's Revised Unabridged Dictionary (1913)