yellow jack

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.

The noun has 3 meanings:

Meaning #1: caused by a virus transmitted by a mosquito
  Synonyms: yellow fever, black vomit

Meaning #2: yellow flag hoist on a ship in quarantine

Meaning #3: fish of western Atlantic and Gulf of Mexico
  Synonym: Caranx bartholomaei