Yellow jack: 1) The flag displayed from lazarettos, naval hospitals, and vessels in quarantine. 2) Synonym for yellow fever as, for example, in "...Fernando passed a few weeks recovering from a touch of yellow jack."
Yellow jack: 1) The flag displayed from lazarettos, naval hospitals, and vessels in quarantine. 2) Synonym for yellow fever as, for example, in "...Fernando passed a few weeks recovering from a touch of yellow jack."
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