Carrier

One who, or that which, carries or conveys; a messenger.

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

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.

(genetics) an organism that possesses a recessive gene whose effect is masked by a dominant allele; the associated trait is not apparent but can be passed on to offspring

(medicine) a person (or animal) who has some pathogen to which they are immune but who can pass it on to others

a radio wave that can be modulated in order to transmit a signal