Definition of "Carrier" :

noun: (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

noun: a large warship that carries planes and has a long flat deck for takeoffs and landings

noun: a rack attached to a vehicle; for carrying luggage or skis or the like

noun: a self-propelled wheeled vehicle designed specifically to carry something

"Refrigerated carriers have revolutionized the grocery business."

noun: a person or firm in the business of transporting people or goods or messages

noun: (medicine) a person (or animal) who has some pathogen to which he is immune but who can pass it on to others

noun: a boy who delivers newspapers

noun: someone whose employment involves carrying something

"The bonds were transmitted by carrier."

noun: a man who delivers the mail

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

noun: an inactive substance that is a vehicle for a radioactive tracer of the same substance and that assists in its recovery after some chemical reaction