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. 1  A condition which results into accelerated destruction of RBCs in the fetus/newborn. First pregnancy: stimulus for immunization (RBC from fetus) and is often not affected; subsequent pregnancies would then potentially be affected. IgG.