Wiktionary
a negative
a. (context medicine English) Of a blood type within the ABO and Rh blood grouping system. Blood type '''A negative''' has a phenotype of "A" and a Rhesus system classification of negative.
Usage examples of "a negative".
Furthermore, since awards for sentimental family relationships are generally forbidden, and survivors may not seek damages for mental suffering or grief, he may even end with a negative value, going so far as to tempt the defendant, where contributory negligence is involved, to turn the tables and sue for recovery himself.