yellow jack

yellow jack

noun, plural ( especially collectively ) yel·low jack ( especially referring to two or more kinds or species ) yel·low 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

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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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

Collins English Dictionary - Complete & Unabridged 10th Edition
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Yellow jack is always a great word to know.
So is ninnyhammer. Does it mean:
a chattering or flighty, light-headed person.
a fool or simpleton; ninny.
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