Note: * Precertification of denosumab (Prolia and Xgeva) is required of all Aetna participating providers and members in applicable plan designs. For precertification of denosumab (Prolia and Xgeva), call (866) 503-0857, or fax (866) 267-3277.
(psychol) the influence of an experimenter's expectations on his results. experimenter effect in Medicine. experimenter effect n. The influence of the experimenter's behavior, personality traits, or expectancies on the results of his or her own research.
effector. 1  Also, effecter. a person or thing that effects. 2  Physiology. an organ or cell that carries out a response to a nerve impulse. 3  Biochemistry. a substance, as a hormone, that increases or decreases the activity of an enzyme.