Definition of "blood group" [blood group]

• Any of several immunologically distinct, genetically determined classes of human blood that are based on the presence or absence of certain antigens and are clinically identified by characteristic agglutination reactions. Also called blood type. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "A different blood group is someone who hasn’t read Bulgakov’s Master and Margarita, which was officially published two years ago, and who prefers a soccer match to a Tarkovsky film."
• "If they found a tissue match they'd kill all her own bone marrow with radiation, which makes the children terribly nauseous and wretched, and then when the marrow's all dead they transfuse new liquid marrow into the veins and hope it will migrate into the bones and start making leukaemia-free blood there, and quite often it works … and sometimes a child can be born with one blood group and be transfused with another."
• "A different blood group is someone who thinks that Mikhail Baryshnikov, who has just defected to the West during one of the Kirov Theatre ballet tours, is a traitor and the enemy of the motherland."