triple E

noun

variants or Triple E
: eastern equine encephalitis
Public health officials have found Eastern equine encephalitis in a pool of mosquitoes in Pembroke. … the discovery of the disease, known as triple E, does not present an imminent danger to humans …—Casey Ross
State health officials suspected the man had Triple E but did not get conclusive test results until yesterday afternoon.—The Boston Sunday Globe

Examples of triple E in a Sentence

Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
Massachusetts is an example of a state that has been proactive about testing mosquitoes for triple E in recent summers. — Zoya Teirstein, WIRED, 7 Sep. 2024 As for humans, Triple E can have a fatality rate of 30 percent, New York State Health Commissioner James McDonald said in the release. — Natalie Neysa Alund, USA TODAY, 24 Aug. 2023

Word History

First Known Use

1976, in the meaning defined above

Time Traveler
The first known use of triple E was in 1976

Cite this Entry

“Triple E.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/triple%20E. Accessed 2 Oct. 2026.

Medical Definition

triple E

noun
variants or Triple E
: eastern equine encephalitis
Since it is early in the season for the bug-borne viral disease, also known as EEE or "triple E," Chesapeake Health Department officials want area residents to start taking more precautions against mosquitoes.—Janette Rodrigues, The Virginian-Pilot (Norfolk, Virginia)
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