1. genetics a carrier of a pollen or disease 2. genetics a self-replicating DNA molecule (usually a plasmid, virus, or bacteriophage) used to move foreign DNA into a organism 3. zoology any agent, particularly animals (and typically insects) but also seed, wind, and water, capable of transplanting a microorganism to a host 4. entomology, pathology to transplant a microorganism to a host 5. GIS —see vector dataThis definition last updated 08/17/2008