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yellow jack

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noun, plural (especially collectively) yel·low jack, (especially referring to two or more kinds or species) yel·low jacks for 3.
Informal. quarantine flag.
Pathology. yellow fever.
any carangoid fish, especially a Caribbean food fish, Caranx bartholomaei.
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Origin of yellow jack

An Americanism dating back to 1830–40
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

How to use yellow jack in a sentence

British Dictionary definitions for yellow jack

yellow jack

noun
pathol another name for yellow fever
another name for quarantine flag
any of certain large yellowish carangid food fishes, esp Caranx bartholomaei, of warm and tropical Atlantic waters
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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