quarantine flag

noun

Medical Definition of quarantine flag

: a yellow flag hoisted by all ships to request pratique on entering a harbor, by a ship to show that it has contagious or infectious disease aboard, or by a ship that has been quarantined

called also yellow flag, yellow jack

Learn More About quarantine flag

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Cite this Entry

“Quarantine flag.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/quarantine%20flag. Accessed 24 Jul. 2021.

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