Definition of yellow jack in English:

yellow jack

noun

  • 1

    archaic term for yellow fever
    • ‘Yellow fever (also called yellow jack, black vomit or sometimes American Plague) is an acute viral disease.’
    • ‘Not even inland towns were safe from the fever known as yellow jack.’
    • ‘Yellow fever, also known as yellow jack for the quarantine flag flown by ships at sea, became one of the most feared diseases throughout urban America.’
    • ‘Yellow Jack or yellow fever is spread by the yellow-fever mosquito (known also as the "Tiger" mosquito).’
    • ‘For more than 250 years, the yellow jack had ravaged the Americas, bringing death to millions and striking panic in entire populations.’
  • 2A ship's yellow quarantine flag.