n. [ From Carry. ] 1. One who, or that which, carries or conveys; a messenger. [ 1913 Webster ]

The air which is but . . . a carrier of the sounds. Bacon. [ 1913 Webster ]

2. One who is employed, or makes it his business, to carry goods for others for hire; a porter; a teamster. [ 1913 Webster ]

The roads are crowded with carriers, laden with rich manufactures. Swift. [ 1913 Webster ]

3. (Mach.) That which drives or carries; as: (a) A piece which communicates to an object in a lathe the motion of the face plate; a lathe dog. (b) A spool holder or bobbin holder in a braiding machine. (c) A movable piece in magazine guns which transfers the cartridge to a position from which it can be thrust into the barrel. [ 1913 Webster ]

Carrier pigeon (Zool.), a variety of the domestic pigeon used to convey letters from a distant point to to its home. --
Carrier shell (Zool.), a univalve shell of the genus Phorus; -- so called because it fastens bits of stones and broken shells to its own shell, to such an extent as almost to conceal it. --
Common carrier (Law.) See under Common, a. [ 1913 Webster ]

pos>n. A construction worker whose main function is to carry construction materials in a hod{ 1 }. [ PJC ]

n. A person who delivers the mail; -- also called a letter carrier. A male mail carrier is also called a mailman.
Syn. -- postman, letter carrier, carrier, mailman. [ WordNet 1.5 +PJC ]