carrier definition

1. someone whose employment involves carrying something
• examples: the bonds were transmitted by carrier
2. a self-propelled wheeled vehicle designed specifically to carry something
• examples: refrigerated carriers have revolutionized the grocery business
3. 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
4. a person or firm in the business of transporting people or goods or messages
5. a radio wave that can be modulated in order to transmit a signal
6. a boy who delivers newspapers
7. (medicine) a person (or animal) who has some pathogen to which he is immune but who can pass it on to others
8. a rack attached to a vehicle; for carrying luggage or skis or the like
9. (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