- 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
WordReference Random House Unabridged Dictionary of American English © 2026
yel′low jack′, pl. (esp. collectively) jack, (esp. referring to two or more kinds or species) jacks for 3.
- [Informal.]See quarantine flag.
- PathologySee yellow fever.
- Fishany carangoid fish, esp. a Caribbean food fish, Caranx bartholomaei.
- 1830–40, American.
Collins Concise English Dictionary © HarperCollins Publishers::
yellow jack n
'yellow jack' also found in these entries (note: many are not synonyms or translations):