/ Dictionary / Index B blood group: Meaning and Definition of Find definitions for: blood' group" Pronunciation: [key] — Med. Med. any of various classes into which human blood can be divided according to immunological compatibility, based on the presence or absence of specific antigens on red blood cells. Also calledCf. ABO system, Rh factor. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. blood fluke blood grouping Related Content Daily Word Quiz: secular Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language