yellow jack

yellow jack

noun, plural (especially collectively) yellow jack (especially referring to two or more kinds or species) yellow jacks for 3.
1.
Informal. quarantine flag.
2.
Pathology, yellow fever.
3.
any carangoid fish, especially a Caribbean food fish, Caranx bartholomaei.

Origin:
1830–40, Americanism

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World English Dictionary
yellow jack
 
n
1.  pathol another name for yellow fever
2.  another name for quarantine flag
3.  any of certain large yellowish carangid food fishes, esp Caranx bartholomaei, of warm and tropical Atlantic waters

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