Jansky's classification

[jănskēz, yän-]

n.

The classification of the blood groups of humans into I, II, III, and IV, now designated, respectively, as O, A, B, and AB.

The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.