An individual who secrets his or her blood-type antigen(s) in bodily fluids. Before DNA technology, blood type from bodily fluids other than blood could only be obtained from secretors, who make up about 80 percent of the population.

A person who secretes the ABH antigens of the ABO blood group in saliva and other body fluids.

any of various organs that synthesize substances needed by the body and release it through ducts or directly into the bloodstream