yellow jack


Inflections of 'yellow jack' (n):
yellow jacks
npl (All usages. For the fish, mainly used to talk about different types—e.g. "Yellow jacks belong to the Carangidae family")
yellow jack
npl (For the fish, especially as a collective plural—e.g. "The fisherman has a good catch of yellow jack.")

WordReference Random House Unabridged Dictionary of American English © 2026
yellow jack′, pl. (esp. collectively) jack,  (esp. referring to two or more kinds or species) jacks for 3.
  1. [Informal.]See quarantine flag. 
  2. PathologySee yellow fever. 
  3. Fishany carangoid fish, esp. a Caribbean food fish, Caranx bartholomaei.
  • 1830–40, American.

Collins Concise English Dictionary © HarperCollins Publishers::
yellow jack n
  1. 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
'yellow jack' also found in these entries (note: many are not synonyms or translations):

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