juxtaposition (plural juxtapositions) 1  The nearness of objects with little or no delimiter. 2  The extra emphasis given to a comparison when the contrasted objects are close together.
Hemolytic disease of the newborn (HDN), also known as alloimmune HDN or erythroblastosis fetalis, is a potentially fatal alloimmune condition where fetal red blood cells are destroyed by transplacentally acquired maternal antibodies. RhD is the most common offending paternal antigen.
Hemolytic disease of the newborn is also called erythroblastosis fetalis. This condition occurs when there is an incompatibility between the blood types of the mother and baby. Hemolytic means breaking down of red blood cells. Erythroblastosis refers to making of immature red blood cells.