Meaning of graft-versus-host disease

graft'-ver•sus-host' disease"

Pronunciation: (graft'vûr"sus-hōst', gräft'-), [key]
  1. a reaction in which the cells of transplanted tissue immunologically attack the cells of the host organism, occurring esp. in bone-marrow transplants.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.