Longman Dictionary of Contemporary English
blood group
noun
EXAMPLES FROM CORPUS
▪ And three of them needed A-Negative, Faye's blood group.
▪ Is blood group an inherited characteristic?
▪ One test will determine your blood group, and another will reveal your Rhesus factor.
▪ Some of the antibodies we used were studied at the international workshop on blood group antibodies at Paris, 1987.
▪ The first thing he saw was her blood group.
Wiktionary
blood group
n. A blood type
WordNet
blood group
n. people whose blood (usually just the red blood cells) has the same antigens [syn: blood type]