El Niño

noun

El Ni·​ño el-ˈnē-nyō How to pronounce El Niño (audio)
plural El Niños
: an irregularly recurring flow of unusually warm surface waters from the Pacific Ocean toward and along the western coast of South America that prevents upwelling of nutrient-rich cold deep water and that disrupts typical regional and global weather patterns compare la niña

Did you know?

Each year around Christmas time, a warm equatorial current flows southward along the coast of Peru. In the 19th century, Peruvian fisherman named that annual current "El Niño" in honor of the Christ child (el niño means "the child" in Spanish). Later, when scientists noted that in some years this warm current flow is more intense than usual, they adopted the name and applied it to that more potent but erratic climatic phenomenon. Now El Niño is used almost exclusively for the severe episodes rather than for the annual ones to which it was originally applied.

Examples of El Niño in a Sentence

Recent Examples on the Web
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Forecasters are predicting a substantial El Nino, a cyclical and natural process in which patches of the equatorial Pacific warm and alter the world’s weather patterns, including rainfall. ABC News, 20 May 2026 Meanwhile, El Nino's influence in the Atlantic basin nudges conditions in the opposite direction, with relatively cooler waters and more vertical wind shear, which does not make for the most ideal environment for tropical system development. Nikki Nolan, CBS News, 15 May 2026 Roys said that while El Nino’s are rare, Super El Nino’s are even rarer. Stephen Underwood, Hartford Courant, 11 May 2026 An El Nino pattern is forecast to push drought conditions in Canada to their extremes this summer, setting the stage for more active wildfires. Caden Perry, jsonline.com, 8 May 2026 Dana Taylor: John, there's also been talk of a coming El Nino later this year. Dana Taylor, USA Today, 17 Apr. 2026 The effects of El Nino are felt differently around the world, says Roundy. Simmone Shah, Time, 10 Apr. 2026 And the next year or so looks to turn the dial up on global warmth even more, as some forecasts predict a brewing El Nino will reach superstrength. Seth Borenstein, Fortune, 8 Apr. 2026 The atmospheric reactions to El Nino and La Nina have changed and the Sierra snowpack is running at historically low levels. Greg Porter, San Francisco Chronicle, 26 Mar. 2026

Word History

Etymology

Spanish, literally, the child (i.e., the Christ child); from the appearance of the flow at the Christmas season

First Known Use

1896, in the meaning defined above

Time Traveler
The first known use of El Niño was in 1896

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Cite this Entry

“El Niño.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/El%20Ni%C3%B1o. Accessed 25 May. 2026.

Kids Definition

El Niño

noun
El Ni·​ño el-ˈnē-nyō How to pronounce El Niño (audio)
plural El Niños
: an irregularly occurring flow of unusually warm surface water along the western coast of South America that disrupts the normal regional and global weather patterns compare la niña
Etymology

Spanish, "the child" (referring to the Christ child); from the appearance of the flow at the Christmas season

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