Rh factor Hear it!

Rh factor definition

☆ Rh· factor (är′āc̸h′)

a group of antigens, determined by heredity and usually present in human red blood cells, which may cause hemolytic reactions during pregnancy or after transfusion of blood containing this factor into someone lacking it

Etymology: rh(esus): from having been discovered first in the blood of rhesus monkeys

Webster's New World College Dictionary Copyright © 2009 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.

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