O

12 entries found for O.
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O O[1] O[2] o- c/o dinitro-o-cresol o- O antigen padimate O penicillin O six-o-six toluidine blue O

Main Entry: O
Pronunciation:
Function: noun
: the one of the four ABO blood groups characterized by the absence of antigens designated by the letters A and B and by the presence of antibodies against these antigens