Definition of "severe combined immunodeficiency" [severe combined immunodeficiency]
A usually fatal congenital disorder of the immune system in which the body is unable to produce enough B cells and T cells to resist infection.(noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.