carrier

noun

1. a person or thing that carries, as one who delivers mail or newspapers, or a train, bus, airplane, etc.
2. 1. a person or company in the business of transporting goods or passengers
   2. a company in the business of providing telephone service
3. a messenger or porter
4. a container, support, or course in or on which something is carried or conducted, as a mechanical part or device or a water conduit
5. a reclining plastic seat for a baby, which may be carried or set down
6. a company that insures a certain person, organization, etc.
7. aircraft carrier
8. a person or animal that carries and transmits disease germs or recessive genes, esp. a person who does not seem to be affected by them
9. Chem.
   1. a catalytic agent that causes an element or radical to be transferred from one compound to another
   2. a body which supports the catalyst deposited in or on it
   3. a relatively large quantity of a stable substance that is combined with a minute quantity of an isotope, esp. one that is a radioactive tracer, to facilitate its handling
10. Electronics an electron, ion, hole, etc. whose movement constitutes a flow of electric current
11. Radio, TV the steady transmitted wave whose amplitude, frequency, or phase is modulated by the signal