mail boat(n = noun.artifact) mailboat, packet, packet boat - a boat for carrying mail; Array
is a kind of boat

   a boat that carries the mail. [WordNet 1.5]

1st-class mail, air mail, banana boat, boat, boat bug, boat club, boat deck, boat hook, boat paddle, boat race, boat racing, boat shell, boat train, boat whistle, bulk mail, canal boat, cattle boat, chain mail, coat of mail, dead mail, direct mail, electronic mail, express mail, fan mail, first-class mail, fishing boat, flying boat, gravy boat, guard boat, hate mail, jolly boat, junk mail, mackinaw boat, mail, mail bag, mail call, mail car, mail carrier, mail clerk, mail coach, mail fraud, mail order, mail order house, mail out, mail pouch, mail service, mail slot, mail train, masoola boat, massoola boat, masula boat, miss the boat, mosquito boat, motor torpedo boat, narrow boat, packet boat, patrol boat, picket boat, pilot boat, pleasure boat, police boat, pt boat, racing boat, registered mail, ring mail, river boat, rowing boat, sailing boat, sea boat, ship's boat, small boat, snail mail, surface mail, third-class mail, torpedo boat, una boat, voice mail