Definition of roseola in US English:



  • 1A rose-colored rash occurring in measles, typhoid fever, syphilis, and some other diseases.

    • ‘Most other respiratory viruses (such as regular measles, mumps, roseola, mononucleosis [‘mono’] and bronchiolitis) don't seem to increase the normal risk for birth defects.’
    • ‘In your daughter's case, I think she may be having either heat rash, eczema, rubella or bacterial infection - but not chicken pox, measles or roseola because these are accompanied by high fever.’
    spots, skin eruption, breakout
    View synonyms
    1. 1.1 A disease of young children in which a fever is followed by a rash, caused by a herpes virus.
      • ‘Infants infected with HHV 6 may develop roseola, a mild rash that disappears within several days.’
      • ‘I had been wondering if the assessment of Intestines Wind / Heat had been a bit off, but at that point the baby developed a whole body rash - red points - diagnosed by the MD as roseola.’
      • ‘Roseola (also known as sixth disease, exanthem subitum, and roseola infantum) is a viral illness in young children, most commonly affecting children between the ages of 6 months and 2 years.’
      • ‘Infection made most children ill, and symptoms included fever, irritability, runny nose, rash, roseola, and diarrhea.’
      • ‘Take your child to the doctor if she has symptoms of roseola.’
      • ‘A diagnosis of roseola is often uncertain until the fever drops and the rash appears, so the doctor may order tests to make sure that the fever is not caused by another type of infection.’
      • ‘Illnesses that most commonly cause febrile convulsions include viral upper respiratory infections such as flu, ear infections, or roseola (a virus causing a temperature and rash).’
      • ‘Seizures are most likely to occur early in an illness (such as roseola, colds, gastrointestinal infection) when the fever is rising quickly.’
      • ‘Human herpesvirus 6, the cause of childhood roseola, has been detected in the lungs of some patients with idiopathic pneumonia.’
      • ‘Although roseola is contagious, you probably can't protect your child from it because it is usually spread by respiratory droplets or saliva from a child who has no obvious symptoms of the illness.’


Early 19th century: modern variant of rubeola, from Latin roseus ‘rose-colored’.