blood group

  1. any of several groups, or systems, of agglutinogens present on the surface of normal red blood cells, such as the ABO system
  2. blood type

See blood group in American Heritage Dictionary 4

noun
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.

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