Noun: yellow jack ye-low jak
- Yellow flag hoist on a ship in quarantine
"The yellow jack warned other vessels to keep their distance"
- Fish of western Atlantic and Gulf of Mexico, also known as the coolihoo (Caranx bartholomaei)
"Yellow jacks often gather in schools around reef areas";
- Caranx bartholomaei
- Caused by a flavivirus transmitted by a mosquito
"Travelers to certain tropical regions were required to show proof of yellow jack vaccination";
- yellow fever, black vomit
Derived forms: yellow jacks
Type of: flag, infectious disease, jack
Encyclopedia: Yellow jack