Definition of yellow jack in English:

yellow jack

Line breaks: yel¦low jack

noun

archaic term for yellow fever.
More example sentences
  • 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.

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