Advertisement - Continue reading below

Definition of "mononucleosis" [mononucleosis]

  • The presence of an abnormally large number of white blood cells with single nuclei in the bloodstream. (noun)
  • Infectious mononucleosis. (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.

Use "mononucleosis" in a sentence
  • "-- RB Rolandon Finch, who had the end of his freshman year wiped out by mononucleosis, is expected back for spring."
  • "The virus that causes infectious mononucleosis is excreted for months, sometimes years, in body fluids, but only appears to be contagious during the early phase of the illness."
  • "The one time I asked to clock out early and go home was when I showed up with a viral infection called mononucleosis that I could have passed on to my co-workers and customers with a cough or a sneeze."
Words like "mononucleosis"