| Yellow jack | fish of western Atlantic and Gulf of Mexico |
|---|---|
| Yellow jack | yellow flag hoist on a ship in quarantine |
| Yellow jack | caused by a virus transmitted by a mosquito |
| Yellow jack | small yellow-marked social wasp commonly nesting in the ground |
| Yellow jack | a barbiturate (trade name Nembutal) used as a sedative and hypnotic and anti-spasmodic |