1. rhesus factor-a blood group antigen possessed by Rh-positive people; if an Rh-negative person receives a blood transfusion from an Rh-positive person it can result in hemolysis and anemia. Rh, Rh factor.. rhesus factor-a blood group antigen possessed by Rh-positive people; if an Rh-negative person receives a blood transfusion from an Rh-positive person it can result in hemolysis and anemia. Rh, Rh factor.
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Psychology Glossary. Pruning. Pruning, as referred to in Neuropsychology, refers to the natural and lifelong physiological reduction of neurons, synapses and axons that occurs in the brains of mammals, including humans. This occurs primarily between birth and sexual maturity, although the process continues at a slower throughout the lifespan.