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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Retrolisthesis. is the term used to define a degenerative and an acute spine condition in which a single vertebra gets displaced and moves backwards onto the vertebra lying immediately below it.Vertebrae are the bones that make up the spinal column and are separated from each other by cushioning intervertebral discs.s the term used to define a degenerative and an acute spine condition in which a single vertebra gets displaced and moves backwards onto the vertebra lying immediately below it.