) jack, (especially referring to two or more kinds or species
) jacks for 3. | 1. | Informal. quarantine flag. |
| 2. | Pathology. yellow fever. |
| 3. | any carangoid fish, esp. a Caribbean food fish, Caranx bartholomaei. |

| an acute, often fatal, infectious febrile disease of warm climates, caused by an RNA virus transmitted by a mosquito, esp. Aedes aegypti, and characterized by liver damage and jaundice. |
| yellow fever n. An infectious tropical disease caused by an arbovirus transmitted by mosquitoes of the genera Aedes, especially A. aegypti, and Haemagogus and characterized by high fever, jaundice, and often gastrointestinal hemorrhaging. Also called yellow jack. |
| yellow jack n.
|
yellow fever n.
An infectious tropical disease caused by an arbovirus transmitted by mosquitoes of the genera Aedes, especially A. aegypti, and Haemagogus and characterized by high fever, jaundice, and vomit that is dark in color as a result of gastrointestinal hemorrhaging.
| yellow fever (yěl'ō) Pronunciation Key
A life-threatening infectious disease caused by a virus of the genus Flavivirus and characterized by fever, jaundice, and internal bleeding. Yellow fever occurs mainly in tropical regions of Africa and Latin America and is transmitted by mosquitoes. |