yellow jack

  1. yellow fever
  2. a yellow flag used as a signal of quarantine
  3. an edible, gold-and-silver marine jack fish (Caranx bartholomaei) found near Florida and the West Indies

See yellow jack in American Heritage Dictionary 4

noun
  1. A yellowish-silver carangid food fish (Caranx bartholomaei) of western Atlantic and Caribbean waters.
  2. Nautical A yellow flag hoisted on a ship to request pratique or warn of disease on board.
  3. See yellow fever.
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