yellow jack

/'jelou'dʤæk/

Học thuật

Thân thiện

A yellow jack swims among the coral reef.

Definition

Noun:
- A type of fish: A marine fish (Caranx bartholomaei) found in the western Atlantic Ocean and the Gulf of Mexico, known for its yellowish color.
- A quarantine flag: A yellow flag (also called the "Q flag") hoisted on a ship to indicate it is under quarantine, requesting pratique (clearance from port health authorities) because it may carry disease.
- Yellow fever: An acute viral hemorrhagic disease caused by a flavivirus, transmitted by mosquitoes, and characterized by symptoms such as fever and jaundice (which can cause yellowing of the skin).

Usage Examples

Noun (Fish):
- The angler was thrilled to catch a large yellow jack.
- Yellow jack are often found near reefs in the Caribbean.
Noun (Flag):
- The ship entered the harbor flying the yellow jack.
- Seeing the yellow jack, the port authorities knew to approach with caution.
Noun (Disease):
- In the 18th century, outbreaks of yellow jack were common in tropical ports.
- The symptoms of yellow jack include high fever and liver damage.

Advanced Usage

The term is historically significant, especially in nautical and medical contexts from the 18th and 19th centuries.
As a flag, the yellow jack specifically signals a request for quarantine inspection, not necessarily that disease is confirmed on board.

Variants and Related Words

Synonyms

For the fish: amberjack (a related species, but not identical).
For the flag: quarantine flag, Q flag.
For the disease: yellow fever, black vomit (an archaic term based on a symptom).

Related Phrases

To fly the yellow jack: To display the quarantine flag.
- The vessel had to fly the yellow jack for 40 days before being granted pratique.
Struck by yellow jack: Infected with yellow fever.
- Many sailors were struck by yellow jack during the voyage.

A yellow jack swims among the coral reef.

Noun

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