1. Rh-null - Noun
2. Rh-null - Adjective
Rh-null (not comparable)
Pertaining to the Rh-null syndrome, or blood produced by the syndrome.
Rh-null (uncountable)
Ellipsis of Rh-null blood.; a blood type, in which red blood cells are completely lacking in all antigens of the Rh-blood-typing system (Rh factors), a system of 61 antigen types.