An absence of white blood cells in the blood. Usually used in reference to varieties of leukemic disease in which the blood's white cell count is normal or low but contains a few young white blood cells.
The leukemic changes in bone marrow associated with a subnormal number of white blood cells in the blood.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.