Definition 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."
Source: MedTerms™ Medical Dictionaryhttp://www.medterms.com/script/main/art.asp?articlekey=18088
Last Editorial Review: 6/14/2012
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