noun
Usage: usually capitalized O
: a blood group characterized by a serum that does not agglutinate the cells of any other member of the ABO system — called also universal donor
noun
Usage: usually capitalized O
: a blood group characterized by a serum that does not agglutinate the cells of any other member of the ABO system — called also universal donor
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012